[issue6423] The cgi docs should advertize using "in" instead of "has_key"

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

Your patch looks good.  I was going to opine that mentioning
__contains__ was good because it would lead the reader to understand how
'in' is supported, but since the len function is referenced but that
doesn't let you learn about __len__, you might as well be consistent and
talk about in and not __contains__.  So I'd vote for changing the 3.x
docs to match.

I agree with you about the example.

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nosy: +r.david.murray

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