message: docs: fix aws_request_signing's config example
diff: @@ -25,6 +25,8 @@ Example filter configuration:
  name: envoy.filters.http.aws_request_signing
  typed_config:
  "@type": type.googleapis.com/envoy.config.filter.http.aws_request_signing.v2alpha.AwsRequestSigning
  + service_name: s3
  + region: us-west-2
  Statistics
  