[issue18390] Better documenting of ``hg revert -r`` when merging with another branch

[Roundup Robot]

Roundup Robot added the comment:

New changeset 15249b189347 by Brett Cannon in branch 'default':
Issue #18390: Add a little comment on how to do a proper file
http://hg.python.org/devguide/rev/15249b189347

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nosy: +python-dev

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<http://bugs.python.org/issue18390>
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