[docs] [issue30588] Missing documentation for codecs.escape_decode

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

We can't change it or remove it, it is public by virtue of its name.  We should document it.

Removing or renaming it to be _private requires a PendingDeprecationWarning -> DeprecationWarning -> removal cycle.  it is well known and used.

https://stackoverflow.com/questions/14820429/how-do-i-decodestring-escape-in-python3/23151714#23151714

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nosy: +gregory.p.smith, njs
versions: +Python 3.8 -Python 3.3, Python 3.4, Python 3.5, Python 3.6

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