[docs] [issue30274] Make importlib.abc.ExtensionFileLoader.__init__() documentation match code

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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stage: needs patch -> patch review
type:  -> enhancement
versions: +Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30274>
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