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

[Brett Cannon]

Brett Cannon added the comment:

Thanks for the patch, Mariatta! Once we have migrated to GitHub we can apply the patch (don't let me forget :) ).

Any version still under active maintenance should probably be updated, so that would probably mean 2.7 but not the other versions.

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<http://bugs.python.org/issue28929>
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