[issue15295] Import machinery documentation

[Brett Cannon]

Brett Cannon added the comment:

While saying "default path importer" vs. "meta path finder" somewhat muddles the term "importer", it definitely gets the point across that PathFinder does a lot more than any other default meta path finder. While _we_ might know that import does nothing more than call a method on sys.meta_path and has no concept of sys.path and friends, most people will consider the default path importer as part of import's semantics and thus not make the distinction.

IOW I like Nick's suggestion.

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