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

[Mariatta Wijaya]

Mariatta Wijaya added the comment:

Patch for 2.7 branch.

The url will change from
https://hg.python.org/cpython/file/2.7/Lib/abc.py

into
https://github.com/python/cpython/blob/2.7/Lib/abc.py

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Added file: http://bugs.python.org/file45906/issue28941v27.patch

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