bug#33097: test has filetest -a but man page doesn't list it

[Martin Schulte]

Hello coreutils maintainers,

test in coreutils 8.30 supports the unary -a test (is the same as -e) but
this is not listed on the manpage (in bash 4.4.12 "help test" does list
it).

I can imagine good reasons to kick out the unary -a but I think it
then should be kicked out of program and man page (or it should be listed
in the man page, maybe as deprecated).

Best regards,

Martin