[issue14332] Better explain "junk" concept in difflib doc

[A.M. Kuchling]

A.M. Kuchling added the comment:

Thanks for your patch!  I took it and added some more text describing what junk is, and clarifying that junk affects what's matched but doesn't cause any differences to be ignored.

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nosy: +akuchling
stage: needs patch -> patch review
Added file: http://bugs.python.org/file34502/14332.patch

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