[docs] [issue26576] Tweak wording of decorator docos

[Berker Peksag]

Berker Peksag added the comment:

Thanks for the patch, Chris. I've only changed `func` to ``func`` (we don't use single backtick in reST.)

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nosy: +berker.peksag
resolution:  -> fixed
stage:  -> resolved
status: open -> closed
type:  -> enhancement
versions: +Python 3.5, Python 3.6

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