[issue4243] has_key doc could be clearer

[David W. Lambert]

David W. Lambert <lambertdw at corning.com> added the comment:

The D'Arcy J.M. Cain wording is clearer.

"dict.has_key(key) is deprecated.  Use "key in dict" instead." would
improve python.

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nosy: +LambertDW

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<http://bugs.python.org/issue4243>
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