Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

- remove -l option from ntpdate manpage, as it is no longer an option

Differential Revision: https://reviews.freebsd.org/D2358
Submitted by: gnn@
Approved by: wblock (mentor)
MFC after: after 1 week

The .Nm utility

Miscellaneous fixes.

In particularly, the -h and -m flags were incorrectly described.

mdoc(7) police: use the new features of the Nm macro.

Add selected manual pages transcribed from the HTML documentation.
Those pages which have not been transcribed are referenced as
gracefully as possible.

There is no perfect section for the ntp_* files, which document
configuration options for the NTP suite, so I'm putting them in
the same section as the pages for the utilities themselves.