spelling: improve camel case handling, disallow run-together words (#8670)

Modifies the pedantic spell checker to better handle camel-case words.
Each part the word is now treated as a separate error in both the check
and fix modes.

Disables run-together mode for aspell, which allowed typos such as
"mananger" (man + anger). Fixes the resulting spelling errors.

Miscellaneous other fixes:
* Provides an option to replace a word without adding the word to the
  dictionary (in case aspell's suggestions do not contain the correct
  replacement).
* Fixes a bug in the script when no suggestions are returned by aspell.
* Checks the dictionary and added words for invalid characters that cause
  aspell errors at dictionary load time.
* Sets the mark flag when in CI runs so that misspelled words are indicated.
* Culls words from the dictionary that are no longer in the codebase, or are
  otherwise not needed.

Risk Level: low (comments only)
Testing: n/a
Doc Changes: n/a
Release Notes: n/a
Fixes: #8481

Signed-off-by: Stephan Zuercher <zuercher@gmail.com>

Mirrored from https://github.com/envoyproxy/envoy @ 596cd4894c8ecd536c1da1dddecaae3531f269ea

envoy/admin/v2alpha/clusters.proto

@@ -53,7 +53,7 @@ message ClusterStatus {
 
   // The success rate threshold used in the last interval when only locally originated failures were
   // taken into account and externally originated errors were treated as success.
-  // This field should be interpretted only when
+  // This field should be interpreted only when
   // :ref:`outlier_detection.split_external_local_origin_errors<envoy_api_field_cluster.OutlierDetection.split_external_local_origin_errors>`
   // is *true*. The threshold is used to eject hosts based on their success rate.
   // See :ref:`Cluster outlier detection <arch_overview_outlier_detection>` documentation for
@@ -108,7 +108,7 @@ message HostStatus {
   // Request success rate for this host over the last calculated
   // interval when only locally originated errors are taken into account and externally originated
   // errors were treated as success.
-  // This field should be interpretted only when
+  // This field should be interpreted only when
   // :ref:`outlier_detection.split_external_local_origin_errors<envoy_api_field_cluster.OutlierDetection.split_external_local_origin_errors>`
   // is *true*.
   // See :ref:`Cluster outlier detection <arch_overview_outlier_detection>` documentation for

envoy/admin/v3alpha/clusters.proto

@@ -53,7 +53,7 @@ message ClusterStatus {
 
   // The success rate threshold used in the last interval when only locally originated failures were
   // taken into account and externally originated errors were treated as success.
-  // This field should be interpretted only when
+  // This field should be interpreted only when
   // :ref:`outlier_detection.split_external_local_origin_errors<envoy_api_field_api.v3alpha.cluster.OutlierDetection.split_external_local_origin_errors>`
   // is *true*. The threshold is used to eject hosts based on their success rate.
   // See :ref:`Cluster outlier detection <arch_overview_outlier_detection>` documentation for
@@ -108,7 +108,7 @@ message HostStatus {
   // Request success rate for this host over the last calculated
   // interval when only locally originated errors are taken into account and externally originated
   // errors were treated as success.
-  // This field should be interpretted only when
+  // This field should be interpreted only when
   // :ref:`outlier_detection.split_external_local_origin_errors<envoy_api_field_api.v3alpha.cluster.OutlierDetection.split_external_local_origin_errors>`
   // is *true*.
   // See :ref:`Cluster outlier detection <arch_overview_outlier_detection>` documentation for

envoy/api/v2/cds.proto

@@ -279,7 +279,7 @@ message Cluster {
 
     // When used with locality_weight_aware, scales the weight of each locality by the ratio
     // of hosts in the subset vs hosts in the original subset. This aims to even out the load
-    // going to an individual locality if said locality is disproportionally affected by the
+    // going to an individual locality if said locality is disproportionately affected by the
     // subset predicate.
     bool scale_locality_weight = 5;
 

envoy/api/v2/route/route.proto

@@ -625,7 +625,7 @@ message RouteAction {
       ConnectionProperties connection_properties = 3;
     }
 
-    // The flag that shortcircuits the hash computing. This field provides a
+    // The flag that short-circuits the hash computing. This field provides a
     // 'fallback' style of configuration: "if a terminal policy doesn't work,
     // fallback to rest of the policy list", it saves time when the terminal
     // policy works.

envoy/api/v3alpha/cds.proto

@@ -274,7 +274,7 @@ message Cluster {
 
     // When used with locality_weight_aware, scales the weight of each locality by the ratio
     // of hosts in the subset vs hosts in the original subset. This aims to even out the load
-    // going to an individual locality if said locality is disproportionally affected by the
+    // going to an individual locality if said locality is disproportionately affected by the
     // subset predicate.
     bool scale_locality_weight = 5;
 

envoy/api/v3alpha/route/route.proto

@@ -578,7 +578,7 @@ message RouteAction {
       ConnectionProperties connection_properties = 3;
     }
 
-    // The flag that shortcircuits the hash computing. This field provides a
+    // The flag that short-circuits the hash computing. This field provides a
     // 'fallback' style of configuration: "if a terminal policy doesn't work,
     // fallback to rest of the policy list", it saves time when the terminal
     // policy works.

envoy/config/filter/network/http_connection_manager/v2/http_connection_manager.proto

@@ -353,7 +353,7 @@ message HttpConnectionManager {
   // .. NOTE::
   //    To be useful in avoiding the race condition described above, this timeout must be set
   //    to *at least* <max round trip time expected between clients and Envoy>+<100ms to account for
-  //    a reasonsable "worst" case processing time for a full iteration of Envoy's event loop>.
+  //    a reasonable "worst" case processing time for a full iteration of Envoy's event loop>.
   //
   // .. WARNING::
   //    A value of 0 will completely disable delayed close processing. When disabled, the downstream

envoy/config/filter/network/http_connection_manager/v3alpha/http_connection_manager.proto

@@ -340,7 +340,7 @@ message HttpConnectionManager {
   // .. NOTE::
   //    To be useful in avoiding the race condition described above, this timeout must be set
   //    to *at least* <max round trip time expected between clients and Envoy>+<100ms to account for
-  //    a reasonsable "worst" case processing time for a full iteration of Envoy's event loop>.
+  //    a reasonable "worst" case processing time for a full iteration of Envoy's event loop>.
   //
   // .. WARNING::
   //    A value of 0 will completely disable delayed close processing. When disabled, the downstream

envoy/config/filter/network/redis_proxy/v2/redis_proxy.proto

@@ -211,8 +211,8 @@ message RedisProxy {
   //
   // When using the above routes, the following prefixes would be sent to:
   //
-  // * 'get abc:users' would retrive the key 'abc:users' from cluster_b.
-  // * 'get ab:users' would retrive the key 'ab:users' from cluster_a.
+  // * 'get abc:users' would retrieve the key 'abc:users' from cluster_b.
+  // * 'get ab:users' would retrieve the key 'ab:users' from cluster_a.
   // * 'get z:users' would return a NoUpstreamHost error. A :ref:`catch-all
   //   route<envoy_api_field_config.filter.network.redis_proxy.v2.RedisProxy.PrefixRoutes.catch_all_route>`
   //   would have retrieved the key from that cluster instead.
@@ -237,7 +237,7 @@ message RedisProxy {
 // :ref:`extension_protocol_options<envoy_api_field_Cluster.extension_protocol_options>`, keyed
 // by the name `envoy.redis_proxy`.
 message RedisProtocolOptions {
-  // Upstream server password as defined by the `requirepass directive
+  // Upstream server password as defined by the `requirepass` directive
   // <https://redis.io/topics/config>`_ in the server's configuration file.
   api.v2.core.DataSource auth_password = 1;
 }

envoy/config/filter/network/redis_proxy/v3alpha/redis_proxy.proto

@@ -199,8 +199,8 @@ message RedisProxy {
   //
   // When using the above routes, the following prefixes would be sent to:
   //
-  // * 'get abc:users' would retrive the key 'abc:users' from cluster_b.
-  // * 'get ab:users' would retrive the key 'ab:users' from cluster_a.
+  // * 'get abc:users' would retrieve the key 'abc:users' from cluster_b.
+  // * 'get ab:users' would retrieve the key 'ab:users' from cluster_a.
   // * 'get z:users' would return a NoUpstreamHost error. A :ref:`catch-all
   //   route<envoy_api_field_config.filter.network.redis_proxy.v3alpha.RedisProxy.PrefixRoutes.catch_all_route>`
   //   would have retrieved the key from that cluster instead.
@@ -225,7 +225,7 @@ message RedisProxy {
 // :ref:`extension_protocol_options<envoy_api_field_api.v3alpha.Cluster.extension_protocol_options>`,
 // keyed by the name `envoy.redis_proxy`.
 message RedisProtocolOptions {
-  // Upstream server password as defined by the `requirepass directive
+  // Upstream server password as defined by the `requirepass` directive
   // <https://redis.io/topics/config>`_ in the server's configuration file.
   api.v3alpha.core.DataSource auth_password = 1;
 }

envoy/service/auth/v2/attribute_context.proto

@@ -92,7 +92,7 @@ message AttributeContext {
 
     // The HTTP request headers. If multiple headers share the same key, they
     // must be merged according to the HTTP spec. All header keys must be
-    // lowercased, because HTTP header keys are case-insensitive.
+    // lower-cased, because HTTP header keys are case-insensitive.
     map<string, string> headers = 3;
 
     // The request target, as it appears in the first line of the HTTP request. This includes

envoy/service/auth/v3alpha/attribute_context.proto

@@ -92,7 +92,7 @@ message AttributeContext {
 
     // The HTTP request headers. If multiple headers share the same key, they
     // must be merged according to the HTTP spec. All header keys must be
-    // lowercased, because HTTP header keys are case-insensitive.
+    // lower-cased, because HTTP header keys are case-insensitive.
     map<string, string> headers = 3;
 
     // The request target, as it appears in the first line of the HTTP request. This includes