message: TFE: Add compatbility doc string to add_to_collection() and friends
diff: @@ -4975,6 +4975,10 @@ def add_to_collection(name, value):
  name: The key for the collection. For example, the `GraphKeys` class
  contains many standard names for collections.
  value: The value to add to the collection.
  +
  + @compatibility(eager)
  + Collections are not supported when eager execution is enabled.
  + @end_compatibility
  """
  get_default_graph().add_to_collection(name, value)
  @@ -4989,6 +4993,10 @@ def add_to_collections(names, value):
  names: The key for the collections. The `GraphKeys` class
  contains many standard names for collections.
  value: The value to add to the collections.
  +
  + @compatibility(eager)
  + Collections are not supported when eager execution is enabled.
  + @end_compatibility
  """
  get_default_graph().add_to_collections(names, value)
  @@ -5008,6 +5016,10 @@ def get_collection_ref(key):
  list if no value has been added to that collection. Note that this returns
  the collection list itself, which can be modified in place to change the
  collection.
  +
  + @compatibility(eager)
  + Collections are not supported when eager execution is enabled.
  + @end_compatibility
  """
  return get_default_graph().get_collection_ref(key)
  @@ -5032,6 +5044,10 @@ def get_collection(key, scope=None):
  an empty list if no value has been added to that collection. The
  list contains the values in the order under which they were
  collected.
  +
  + @compatibility(eager)
  + Collections are not supported when eager execution is enabled.
  + @end_compatibility
  """
  return get_default_graph().get_collection(key, scope)
  