[issue4243] has_key doc could be clearer

[D'Arcy J.M. Cain]

D'Arcy J.M. Cain <darcy at druid.net> added the comment:

The original is not technically ambiguous modulo the dict/d issue.  The
suggested text just makes it more obvious.

We just don't want to reduce the possibility of no confusion.  :-)

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nosy: +darcy at druid.net

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