[Python-checkins] cpython (2.7): Fix closes Issue12722 - link heapq source in the text format in the

[Terry Reedy]

>
>      Latest version of the `heapq Python source code
> -<http://svn.python.org/view/python/branches/release27-maint/Lib/heapq.py?view=markup>`_
> +<http://svn.python.org/view/*checkout*/python/branches/release27-maint/Lib/heapq.py?content-type=text%2Fplain>`_

Should links be to the hg repository instead of svn?
Is svn updated from hg?
I thought is was (mostly) historical read-only.