docs: remove some duplicated words (#6063)

Correct spelling for code comment.

Co-Authored-By: Nguyen Van Trung [trungnvfet@outlook.com](mailto:trungnvfet@outlook.com)
Signed-off-by: Nguyen Quang Huy [huynq0911@gmail.com](mailto:huynq0911@gmail.com)
Signed-off-by: Nguyen Quang Huy <huynq0911@gmail.com>

Mirrored from https://github.com/envoyproxy/envoy @ caa804febeda4a7b43ff269010807cb5c0567129

envoy/api/v2/route/route.proto

@@ -1201,7 +1201,7 @@ message HeaderMatcher {
     //   "-1somestring"
     envoy.type.Int64Range range_match = 6;
 
-    // If specified, header match will be be performed based on whether the header is in the
+    // If specified, header match will be performed based on whether the header is in the
     // request.
     bool present_match = 7;
 

envoy/config/filter/http/ext_authz/v2/ext_authz.proto

@@ -140,7 +140,7 @@ message ExtAuthzPerRoute {
 // external authorization server on specific virtual hosts \ routes. For example, adding a context
 // extension on the virtual host level can give the ext-authz server information on what virtual
 // host is used without needing to parse the host header. If CheckSettings is specified in multiple
-// per-filter-configs, they will be merged in order, and the result will be be used.
+// per-filter-configs, they will be merged in order, and the result will be used.
 message CheckSettings {
   // Context extensions to set on the CheckRequest's
   // :ref:`AttributeContext.context_extensions<envoy_api_field_service.auth.v2.AttributeContext.context_extensions>`