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

[Brett Cannon]

Brett Cannon added the comment:

No, I'm the one who misunderstood; I read the title of the issue too quickly after reading the doc source link issue and my brain didn't pick up on the "source code" part of the title. Sorry about that.

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