[docs] [issue15288] Clarify the pkgutil.walk_packages() note

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

I changed to term to "loader" and linked to the glossary. I also added a versionchanged note for Python 3.3 so people are not too surprised that pkgutil no longer does what it did in Python 3.2.

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resolution:  -> fixed
status: open -> closed

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