man/openrc.8: update checkpath documentation
man/openrc.8: update checkpath documentation

X-GENTOO-BUG: 500606
X-GENTOO-BUG-URL: https://bugs.gentoo.org/show_bug.cgi?id=500606

OpenRC/openrc,dwfreed/openrc,williamh/openrc,dwfreed/openrc,dwfreed/openrc,OpenRC/openrc,williamh/openrc,williamh/openrc,OpenRC/openrc