message: Fix docstring of variable_scope()
diff: @@ -1691,7 +1691,7 @@ class variable_scope(object): # pylint: disable=invalid-name
  v1 = foo() # Creates v.
  v2 = foo() # Gets the same, existing v.
  assert v1 == v2
  -
  + ```
  Basic example of sharing a variable with reuse=True:
  