message: Fix comments in enable/disable graph collection
diff: @@ -1261,7 +1261,7 @@ class Context(object):
  pywrap_tensorflow.TFE_ContextEnableGraphCollection(self._handle)
  def disable_graph_collection(self):
  - """Disables graph collections of executed functions."""
  + """Disables graph collection of executed functions."""
  if not self._context_handle:
  return
  pywrap_tensorflow.TFE_ContextDisableGraphCollection(self._context_handle)
  @@ -1600,16 +1600,16 @@ def disable_run_metadata():
  def enable_graph_collection():
  - """Enables tracing of op execution via RunMetadata.
  + """Enables graph collection of executed functions.
  - To retrieve the accumulated metadata call context.export_run_metadata()
  - and to stop tracing call context.disable_run_metadata().
  + To retrieve the accumulated graphs call context.export_run_metadata()
  + and to stop collecting graphs call context.disable_graph_collection().
  """
  context().enable_graph_collection()
  def disable_graph_collection():
  - """Disables tracing of op execution via RunMetadata."""
  + """Disables graph collection of executed functions."""
  context().disable_graph_collection()
  