message: Clarify reuse documentation in variable_scope and eager.
diff: @@ -1908,7 +1908,8 @@ class variable_scope(object):
  for this scope as well as all sub-scopes; if tf.AUTO_REUSE, we create
  variables if they do not exist, and return them otherwise; if None, we
  inherit the parent scope's reuse flag. When eager execution is enabled,
  - this argument is always forced to be tf.AUTO_REUSE.
  + new variables are always created unless an EagerVariableStore or
  + template is currently active.
  dtype: type of variables created in this scope (defaults to the type
  in the passed scope, or inherited from parent scope).
  use_resource: If False, all variables will be regular Variables. If True,
  