[docs] venv 3.3.2 docs - "create_directories" should be "ensure_directories"

To whom it may concern, When subclassing venv.EnvBuilder and customizing create(), the docs say that one should use "self.create_directories(env_dir)". This call raises an AttributeError. When looking at the subclass, I don't see "create_directories" but instead I see the method "ensure_directories", which has the following docstring: "Create the directories for the environment". It seems like either the docs should be fixed to reflect "ensure_directories" as the appropriate method name or the method should be renamed "create_directories". Apologies if I'm mistaken on this ... this is my first doc bug report. Thanks, Mike Rand