[issue15288] Clarify the pkgutil.walk_packages() note

[Ronan Lamy]

Ronan Lamy <ronan.lamy at gmail.com> added the comment:

It seems that most, if not all, uses of "importer" in pkgutil refer to finders, e.g. ImpImporter is a actually only a finder, not an importer. So s/importer/finder/ is needed, and perhaps also a note explaining that ImpImporter isn't in fact an importer, in addition to glossary links.

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nosy: +Ronan.Lamy

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<http://bugs.python.org/issue15288>
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