[docs] [issue33594] add deprecation since 3.5 for a few methods of inspect.

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

See also #33582 for 'formatargspec'.

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nosy: +terry.reedy, yselivanov
versions:  -Python 3.5

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<https://bugs.python.org/issue33594>
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