It is some times hard to understand the difference between
kernel version and userland version. So clarify the -r option
of uname(1) in terms of a printed kernel version.
While here, add some cross references:
- cross reference freebsd-version(1) in uname(1)
- cross reference freebsd-version(1) and uname(1) in freebsd-update(8)
PR: 265594
Reported by: rwatson
MFC after: 1 week