Fix proto import comments

Author: sauravzg

xds/third_party/envoy/import.sh

@@ -80,7 +80,6 @@ envoy/extensions/filters/http/fault/v3/fault.proto
 envoy/extensions/filters/http/rate_limit_quota/v3/rate_limit_quota.proto
 envoy/extensions/filters/http/gcp_authn/v3/gcp_authn.proto
 envoy/extensions/filters/http/rbac/v3/rbac.proto
-envoy/extensions/filters/http/rate_limit_quota/v3/rate_limit_quota.proto
 envoy/extensions/filters/http/router/v3/router.proto
 envoy/extensions/filters/network/http_connection_manager/v3/http_connection_manager.proto
 envoy/extensions/grpc_service/call_credentials/access_token/v3/access_token_credentials.proto