[issue22992] Adding a git developer's guide to Mercurial to devguide

[Roundup Robot]

Roundup Robot added the comment:

New changeset 51c89a0c30b4 by Brett Cannon in branch 'default':
Issue #22992: A git developer's guide to hg.
https://hg.python.org/devguide/rev/51c89a0c30b4

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nosy: +python-dev

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<http://bugs.python.org/issue22992>
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