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

R. David Murray added the comment:

I think that that patch that Victor committed is incorrect, and that Thomas's patch is closer to correct. People *do* use linecache with files other than python source files, and as far as I can see we are not going to stop supporting that. Given the original docs the intent clearly was that the interface be general, not python-file-specific.

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