[docs] [issue19392] document importlib.reload() requires __loader__ to be defined

[Roundup Robot]

Roundup Robot added the comment:

New changeset f575f6298eb1 by Brett Cannon in branch '3.3':
Issue #19392: Document that imp.reload() now relies on __loader__
http://hg.python.org/cpython/rev/f575f6298eb1

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19392>
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