syntax: Make ViewItemUse no longer contain multiple view paths. #13777
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It reflected the obsolete syntax
use a, b, c;
and did not make past the parser (though it was a non-fatal error so we can continue). This legacy affected many portions of rustc and rustdoc as well, so this PR cleans them up altogether.As a side effect of cleanup, we now have
SCHEMA_VERSION
inrustdoc::clean
(instead of the crate root), so it has a better chance to be updated whenrustdoc::clean
gets updated.