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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

This is an internal function kept for compatibility. It is used only for decoding pickle protocol 0 data created in Python 2. Look at unicode_escape and raw_unicode_escape codecs for doing similar decoding to strings in Python 3.

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue30588>
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