[docs] [issue30096] Update examples in abc documentation to use abc.ABC

[Mariatta Wijaya]

Mariatta Wijaya added the comment:


New changeset b0d0217c0e4c1512a06ef306928b2fd8f82d046e by Mariatta (Miss Islington (bot)) in branch '3.6':
[3.6] bpo-30096: Use ABC in abc reference examples (GH-1220) (GH-3408)
https://github.com/python/cpython/commit/b0d0217c0e4c1512a06ef306928b2fd8f82d046e


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nosy: +Mariatta

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