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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 51341af466e3 by Victor Stinner in branch '3.4':
Issue #11726: clarify linecache doc: linecache is written to cache Python
https://hg.python.org/cpython/rev/51341af466e3

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nosy: +python-dev

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