[docs] [issue28929] Provide a link from documentation back to its source file

[Brett Cannon]

Brett Cannon added the comment:

Now that we have migrated to GitHub and Mariatta is a core dev I'm assigning this to her. :)

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assignee: docs at python -> Mariatta

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28929>
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