[docs] [issue29576] Improve some deprecations in the importlib

[Matthias Bussonnier]

New submission from Matthias Bussonnier:

A couple of function in importlib are marked as deprecated in the documentation but do not raise deprecation warnings.

As the same time it would be great to improve some deprecation warnings and docstring to include the version since when this is deprecated. 

This should be take care of by https://github.com/python/cpython/pull/32

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assignee: docs at python
components: Documentation
messages: 287908
nosy: docs at python, mbussonn
priority: normal
pull_requests: 88
severity: normal
status: open
title: Improve some deprecations in the importlib
type: enhancement
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29576>
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