[docs] [issue23006] Improve the doc and indexing of adict.__missing__.

[Terry J. Reedy]

Terry J. Reedy added the comment:

I made a couple more minor revisions to the 3.4 stdtypes text and copied the revised paragraph, with the code example, to 2.7

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resolution:  -> fixed
stage: needs patch -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23006>
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