message: jwt_authn docs: fix Protobuf YAML examples
  Make the YAML examples use lists for `audiences` and avoid starting
  lists for non-repeating fields.
  Risk Level: Low
  Testing: N/A
  Docs Changes: N/A
  Release Notes: N/A
diff: @@ -22,13 +22,13 @@ import "validate/validate.proto";
  // issuer: https://example.com
  // audiences:
  // - bookstore_android.apps.googleusercontent.com
  -// bookstore_web.apps.googleusercontent.com
  +// - bookstore_web.apps.googleusercontent.com
  // remote_jwks:
  -// - http_uri:
  -// - uri: https://example.com/.well-known/jwks.json
  +// http_uri:
  +// uri: https://example.com/.well-known/jwks.json
  // cluster: example_jwks_cluster
  // cache_duration:
  -// - seconds: 300
  +// seconds: 300
  //
  // [#not-implemented-hide:]
  message JwtProvider {
  @@ -50,7 +50,7 @@ message JwtProvider {
  //
  // audiences:
  // - bookstore_android.apps.googleusercontent.com
  - // bookstore_web.apps.googleusercontent.com
  + // - bookstore_web.apps.googleusercontent.com
  //
  repeated string audiences = 2;
  @@ -67,11 +67,11 @@ message JwtProvider {
  // .. code-block:: yaml
  //
  // remote_jwks:
  - // - http_uri:
  - // - uri: https://www.googleapis.com/oauth2/v1/certs
  + // http_uri:
  + // uri: https://www.googleapis.com/oauth2/v1/certs
  // cluster: jwt.www.googleapis.com|443
  // cache_duration:
  - // - seconds: 300
  + // seconds: 300
  //
  RemoteJwks remote_jwks = 3;
  @@ -83,14 +83,14 @@ message JwtProvider {
  // .. code-block:: yaml
  //
  // local_jwks:
  - // - filename: /etc/envoy/jwks/jwks1.txt
  + // filename: /etc/envoy/jwks/jwks1.txt
  //
  // Example: inline_string
  //
  // .. code-block:: yaml
  //
  // local_jwks:
  - // - inline_string: "ACADADADADA"
  + // inline_string: "ACADADADADA"
  //
  envoy.api.v2.core.DataSource local_jwks = 4;
  }
  @@ -163,7 +163,7 @@ message RemoteJwks {
  // .. code-block:: yaml
  //
  // http_uri:
  - // - uri: https://www.googleapis.com/oauth2/v1/certs
  + // uri: https://www.googleapis.com/oauth2/v1/certs
  // cluster: jwt.www.googleapis.com|443
  //
  envoy.api.v2.core.HttpUri http_uri = 1;
  