sln utility is provided by glibc but its manual page shows up
only in util-linux and is not installed by this package.
The sln.8 man page is included in util-linux-2.10o-1, but the Right Thing To Do
is bundle the man page with the executable in glibc. Changing component to glibc
Still needs adjusting in 8.0
glibc doesn't come with any man-pages for the utilities it provides nor its APIs
(with exception of glibc-devel), so IMHO this should go into man-pages like
ldd, ld.so or ldconfig man pages.
sln man page is in man-pages now (man-pages version 2.07-2).