[docs] [issue26435] Fix versionadded/versionchanged documentation directives

[Georg Brandl]

Georg Brandl added the comment:

These are interpreted as comments by docutils. "make suspicious" only checks for markup erroneously remaining in the output. "make check", which runs tools/rstlint.py, should pick them up though.

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nosy: +georg.brandl

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<http://bugs.python.org/issue26435>
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