[docs] [issue28941] Update the link to Source Code in Python Docs from hg to github

[Mariatta Wijaya]

Mariatta Wijaya added the comment:

This was addressed in the very first pull request on CPython GitHub (Thanks, Brett ) 

Backported to 2.7, 3.5, and 3.6

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resolution:  -> fixed
stage:  -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28941>
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