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

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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