[issue18389] document that os.path.relpath does not interrogate the file system

[R. David Murray]

R. David Murray added the comment:

Thanks, Madison.  I tweaked the wording slightly, but the essence is the same :).

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resolution:  -> fixed
stage: needs patch -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18389>
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