[issue16931] mention work-around to create diffs in default/non-git mode

[Ned Deily]

Ned Deily added the comment:

However this is resolved, the information in the devguide should be consistent.  AFAICT, the recommendation to use hg "git" format is currently only mentioned in the Committing section (http://docs.python.org/devguide/committing.html#minimal-configuration) but not elsewhere, in particular, not http://docs.python.org/devguide/patch.html. (This was brought up in Issue10572.) Perhaps both sections could reference a FAQ entry which includes the Rietveld caveats.

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nosy: +ned.deily

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