[docs] [issue22316] Add rule about "extraneous whitespace around colon" to "Whitespace In Expressions and Statements" of PEP8

[Nick Coghlan]

Nick Coghlan added the comment:

Looks good to me! (and covers several cases that hadn't occurred to me
before)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22316>
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