message: Fix tensorflow nccl CODEOWNERS
diff: # Where component owners are known, add them here.
  /tenosrflow/core/debug @caisq
  -/tensorflow/core/nccl/ @azaks @csigg
  +/tensorflow/core/nccl/ @azaks2 @chsigg
  /tensorflow/core/platform/windows/ @mrry
  /tensorflow/core/platform/s3 @yongtang
  /tensorflow/go @asimshankar
  