[docs] [issue22014] Add summary table for OS exception <-> errno mapping

[Jon Poler]

Jon Poler added the comment:

I will give this a shot if it is just hard-coding a table with errno names. Dynamically scraping the errno names and inserting them with the exception hierarchy might be beyond me since I've never used Sphinx before.

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nosy: +jon.poler

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<http://bugs.python.org/issue22014>
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