[issue13388] document hg commit hooks in the devguide

[Eli Bendersky]

Eli Bendersky <eliben at gmail.com> added the comment:

Éric, feel free to fix it to your heart's desire ;-) I think that having it documented is far more important than nuances in nomenclature, so I'm -0 on this.

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<http://bugs.python.org/issue13388>
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