[issue13763] rm obsolete reference in devguide

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

I really think there is no bug.  We don’t have to explain why Mercurial or hg are named so.  The current text merely says that “hg”, which is the name of the executable, is commonly used as a short form of “Mercurial”.

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<http://bugs.python.org/issue13763>
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