docs: update uses of 'SDS' to 'EDS' (#4860)

Signed-off-by: Fred Douglas <fredlas@google.com>

Mirrored from https://github.com/envoyproxy/envoy @ 55dac11411ef78fd435b4f4767ce1bca25c4380f

API_OVERVIEW.md

@@ -9,7 +9,8 @@ Version 2 of the Envoy API evolves existing APIs and introduces new APIs to:
 
 * Allow for more advanced load balancing through load and resource utilization reporting to management servers.
 * Improve N^2 health check scalability issues by optionally offloading health checking to other Envoy instances.
-* Support Envoy deployment in edge, sidecar and middle proxy deployment models via changes to the listener model and CDS/SDS APIs.
+* Support Envoy deployment in edge, sidecar and middle proxy deployment models via changes to the listener model,
+  CDS API, and EDS (formerly called SDS in v1) API.
 * Allow streaming updates from the management server on change, instead of polling APIs from Envoy. gRPC APIs will be supported
   alongside JSON REST APIs to provide for this.
 * Ensure all Envoy runtime configuration is dynamically discoverable via API

envoy/api/v2/cds.proto

@@ -81,7 +81,7 @@ message Cluster {
     // for an explanation.
     LOGICAL_DNS = 2;
 
-    // Refer to the :ref:`service discovery type<arch_overview_service_discovery_types_sds>`
+    // Refer to the :ref:`service discovery type<arch_overview_service_discovery_types_eds>`
     // for an explanation.
     EDS = 3;
 

envoy/config/bootstrap/v2/bootstrap.proto

@@ -39,7 +39,7 @@ message Bootstrap {
     // <envoy_api_field_config.bootstrap.v2.Bootstrap.DynamicResources.cds_config>`, it's necessary
     // to have some initial cluster definitions available to allow Envoy to know
     // how to speak to the management server. These cluster definitions may not
-    // use :ref:`EDS <arch_overview_dynamic_config_sds>` (i.e. they should be static
+    // use :ref:`EDS <arch_overview_dynamic_config_eds>` (i.e. they should be static
     // IP or DNS-based).
     repeated envoy.api.v2.Cluster clusters = 2 [(gogoproto.nullable) = false];
 
@@ -71,10 +71,7 @@ message Bootstrap {
 
     // [#not-implemented-hide:] Hide from docs.
     message DeprecatedV1 {
-      // This is the global :ref:`SDS <arch_overview_dynamic_config_sds>` config
+      // Deprecated service discovery service config for when using API v1 REST.
-      // when using v1 REST for :ref:`CDS
-      // <arch_overview_dynamic_config_cds>`/:ref:`EDS
-      // <arch_overview_dynamic_config_sds>`.
       envoy.api.v2.core.ConfigSource sds_config = 1;
     }