Scaladoc: silence undefined variable msgs #12230
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Those messages aren't very useful, and they pollute our logs.
They get emitted whenever in any part of the docstring, we see something like
$var. Seeing as Scala snippets using quotes have a lot of text that looks like that, we get a lot of warnings.Note that these will, right now, get expanded. Variable expansion happens before we parse comments, so without a refactor we cannot really do much better than to silence the warnings.