[issue2204] document ConfigParser behaviour when a file has same section multiple times

[Łukasz Langa]

Łukasz Langa <lukasz at langa.pl> added the comment:

This bug is superseded by #9452 where the patch includes a `strict=` argument to __init__ which enables checking for section duplicates when reading from a single source.

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<http://bugs.python.org/issue2204>
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