[issue4923] time.strftime documentation needs update

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

%f and %z are not standardized by C89 and therefore not always
available.  They fall under the clause "Additional directives may be
supported on certain platforms, but only the ones listed here have a
meaning standardized by ANSI C." which is noted for time.strftime().

datetime.strftime() implements %z (and %f from 2.6) separately,
therefore it is available there.

I've added a bit of clarification in r68726.

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resolution:  -> fixed
status: open -> closed

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