{{/usr/lib/llvm/13/share/man/man1
/usr/lib/llvm/13/share/man/man1/clang.1.bz2
/usr/lib/llvm/13/share/man/man1/diagtool.1.bz2
/usr/lib/llvm/13/share/man/man1/extraclangtools.1.bz2
/usr/lib/llvm/13/share/man/man1/scan-build.1.bz2}}

is where it installs the manpages. This path is not part of MANPATH, so you can't do `man clang` or `man diagtool` etc, as expected