[docs] [issue23778] Add a visual distinction to multiline versionchanged blocks

[Demian Brecht]

Demian Brecht added the comment:

I noted in #2211 that nested lists are supported by Sphinx, so that solves that specific issue. Perhaps it /may/ still be useful to have this though in order to support multiple paragraphs for more detailed change descriptions when needed? That said, I'm not sure that's something that's necessarily even wanted as such messages are intended to be terse.

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<http://bugs.python.org/issue23778>
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