[docs] [issue10389] Document rules for use of case in section titles

[Éric Araujo]

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

+1 about the patch, if you add an example: “sentence case” may not be obvious for everyone.  If it’s “modulename — Module description”, I agree.

Also, s/white space/whitespace/.

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nosy: +docs at python, eric.araujo

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