[docs] [issue27519] update the references to http://mercurial.selenic.com

[Stéphane Wirtel]

Stéphane Wirtel added the comment:

I just updated to the new url of the Mercurial Wiki for the devguide.

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components: +Devguide -Documentation
keywords: +patch
nosy: +ezio.melotti, willingc
versions: +Python 3.5
Added file: http://bugs.python.org/file43731/issue27519.diff

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