message: Highlight deprecation of *.deprecated_v1 fields in notice
  This is a followup change as requested in this comment in
diff: @@ -8,8 +8,8 @@ A logged warning is expected for each deprecated item that is in deprecation win
  ## Version 1.8.0 (pending)
  -* Use of the v1 API is deprecated. See envoy-announce
  - [email](https://groups.google.com/forum/#!topic/envoy-announce/oPnYMZw8H4U).
  +* Use of the v1 API (including `*.deprecated_v1` fields in the v2 API) is deprecated.
  + See envoy-announce [email](https://groups.google.com/forum/#!topic/envoy-announce/oPnYMZw8H4U).
  * Use of the legacy
  [ratelimit.proto](https://github.com/envoyproxy/envoy/blob/b0a518d064c8255e0e20557a8f909b6ff457558f/source/common/ratelimit/ratelimit.proto)
  is deprecated, in favor of the proto defined in
  