[docs] [issue26019] collections.abc documentation incomplete

[Andrew Barnert]

Andrew Barnert added the comment:

The attached patch is, I think, the smallest change that includes all the necessary information.

Of course it will need to be redone if #25958 goes through, with a version-changed note explaining that prior to 3.6 some of the implicit ABCs (maybe with a list) treated None as an abstract method implementation while others didn't. So, this patch is basically a throwaway. But any review comments would still be useful, of course.

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keywords: +patch
Added file: http://bugs.python.org/file41513/patch26019.diff

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