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

[Roundup Robot]

Roundup Robot added the comment:

New changeset ceb14ecc1942 by R David Murray in branch '3.4':
#11726: Make linecache docs reflect that all files are treated the same.
https://hg.python.org/cpython/rev/ceb14ecc1942

New changeset 1a5c72f9ff53 by R David Murray in branch 'default':
Merge: #11726: Make linecache docs reflect that all files are treated the same.
https://hg.python.org/cpython/rev/1a5c72f9ff53

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<http://bugs.python.org/issue11726>
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