message: docs: hide unimplemented fields
diff: @@ -87,6 +87,7 @@ message HttpConnectionManager {
  // created if the specified header name is present in the request's headers.
  repeated string request_headers_for_tags = 2;
  + // [#not-implemented-hide:]
  // Target percentage of requests managed by this HTTP connection manager that will be force
  // traced if the :ref:`x-client-trace-id <config_http_conn_man_headers_x-client-trace-id>`
  // header is set. This field is a direct analog for the runtime variable
  @@ -95,6 +96,7 @@ message HttpConnectionManager {
  // Default: 100%
  envoy.type.Percent client_sampling = 3;
  + // [#not-implemented-hide:]
  // Target percentage of requests managed by this HTTP connection manager that will be randomly
  // selected for trace generation, if not requested by the client or not forced. This field is
  // a direct analog for the runtime variable 'tracing.random_sampling' in the
  @@ -102,6 +104,7 @@ message HttpConnectionManager {
  // Default: 100%
  envoy.type.Percent random_sampling = 4;
  + // [#not-implemented-hide:]
  // Target percentage of requests managed by this HTTP connection manager that will be traced
  // after all other sampling checks have been applied (client-directed, force tracing, random
  // sampling). This field functions as an upper limit on the total configured sampling rate. For
  