Link man page
It would be nice if ghcup set <version> would create a symlink from ~/.ghcup/share to ~/.ghcup/ghc/<version>/share.
Currently the command man ghc fails with No manual entry for ghc. When this is implemented, provided ~/.ghcup/bin is on the PATH, man would automatically add ~/.ghcup/share/man to its internal MANPATH and man ghc would open the manpage of the current ghc.