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

[Sayan Chowdhury]

Changes by Sayan Chowdhury <sayan.chowdhury2012 at gmail.com>:


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pull_requests: +1826

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