[docs] [issue11726] clarify that linecache only works on files that can be decoded successfully

[R. David Murray]

R. David Murray added the comment:

OK, on further investigation I guess it wasn't intended to be so general :)  But I still think we should make a nod to the reality that it can be used on other text files.  I'll re-close the issue but I may add a sentence to the docs.

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status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11726>
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