tweak test/bench's help around filtering & libtest #5341
Merged
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Attempt to bring more clarity about test/bench's filtering arg by
detailing the distinction and integration between cargo's test/bench and
libtest.
Also make sure to mention how to see libtest's help/usage message.
Fixes #5337
Feedback welcome. Also, how do I auto-generate the man pages in
src/etc/man/? I'm wasn't sure about the escaping to attempt manually
editing.