[issue15295] Import machinery documentation

[Brett Cannon]

Brett Cannon added the comment:

The import path definition is a little misleading as sys.path is only inferred when 'path' has None passed in. Otherwise 'path' is what __path__ in a package is set to, so technically sys.path never even comes into play except by choice from PathFinder as it just chooses to treat None to mean sys.path.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15295>
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