[docs] [issue11948] Tutorial/Modules - small fix to better clarify the modules search path

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

One caveat to Terry’s suggestion: never ever change the case of a Python identifier or keyword (“Sys”).

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nosy: +eric.araujo

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<http://bugs.python.org/issue11948>
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