[docs] [issue37574] Mention spec_from_loader() in Finder.find_spec() docs.

[Roundup Robot]

Change by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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keywords: +patch
pull_requests: +14535
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/14739

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<https://bugs.python.org/issue37574>
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