timerfd.2: Add documentation for CLOCK_UPTIME and CLOCK_BOOTTIME

Add CLOCK_UPTIME and CLOCK_BOOTTIME options and a quick pointer
to clock_gettime(2) for a better definition of these values.

Reviewe

timerfd.2: Add documentation for CLOCK_UPTIME and CLOCK_BOOTTIME

Add CLOCK_UPTIME and CLOCK_BOOTTIME options and a quick pointer
to clock_gettime(2) for a better definition of these values.

Reviewed-by: imp (small tweaks and added Xr)
Pull-Request: https://github.com/freebsd/freebsd-src/pull/1302

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timerfd.2: Remove a double word

- s/is is/is/

MFC after: 3 days

libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths

libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths to allow libc to find them in their new home.

Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908

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timerfd: Add manual page.

This manual page accompanies the timerfd system calls.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D40218