[docs] [issue16544] Add external link to ast docs

Thomas Kluyver added the comment: I think that putting the full content of GTS into the ast module docs would make it awkwardly long. Perhaps the bulk of it could become a howto, and GTS could be maintained separately as a showcase of examples. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue16544> _______________________________________