[issue19713] Deprecate various things in importlib thanks to PEP 451

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2c27c0e5bc50 by Eric Snow in branch 'default':
Issue #19713: Update importlib docs for module spec changes, including deprecations.
http://hg.python.org/cpython/rev/2c27c0e5bc50

New changeset b78de8029606 by Eric Snow in branch 'default':
Issue #19713: Fix mistakes in the import page of language reference.
http://hg.python.org/cpython/rev/b78de8029606

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nosy: +python-dev

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