message: bug: since Scaffold has no attribute of global_step, drop this confused comment
diff: @@ -90,8 +90,6 @@ class Scaffold(object):
  from and stored into the `LOCAL_INIT_OP` collection in the graph by default.
  * `summary_op`: An op to run and merge the summaries in the graph. Picked
  from and stored into the `SUMMARY_OP` collection in the graph by default.
  - * `global_step`: A tensor containing the global step counter. Picked
  - from and stored into the `GLOBAL_STEP` collection in the graph by default.
  You can also pass the following additional pieces to the constructor:
  