[docs] [issue20488] importlib title and introduction are out of date

[Roundup Robot]

Roundup Robot added the comment:

New changeset cc08bf665dea by Brett Cannon in branch '3.3':
Issue #20488: Update docs to say importlib is *the* implementaiton of
http://hg.python.org/cpython/rev/cc08bf665dea

New changeset 5641c0b50072 by Brett Cannon in branch 'default':
Merge for issue #20488
http://hg.python.org/cpython/rev/5641c0b50072

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nosy: +python-dev

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