message: update codeowner for resources
diff: /specification/recoveryservicessiterecovery/ @avneeshrai
  /specification/redis/ @siddharthchatrolams @timlovellsmith
  /specification/relay/ @sethmanheim @v-ajnava
  -/specification/resources/ @rajshah11 @stankovski @vivsriaus
  +/specification/resources/ @Tiano2017 @rajshah11 @vivsriaus
  /specification/scheduler/ @pinwang81
  /specification/search/ @brjohnstmsft
  /specification/serialconsole/ @amitchat @craigw @asinn826
  