message: Document GameQueue environment variables
diff: @@ -322,7 +322,9 @@ class GameQueue:
  print(' games/sec:', len(h)/elapsed)
  -# TODO(president.jackson): document these
  +# PROJECT: the GCP project in which the Cloud Bigtable is located.
  +# CBT_INSTANCE: identifier of Cloud Bigtable instance in PROJECT.
  +# CBT_TABLE: identifier of Cloud Bigtable table in CBT_INSTANCE.
  _games = GameQueue(os.environ['PROJECT'],
  os.environ['CBT_INSTANCE'],
  os.environ['CBT_TABLE'])
  