Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

pnfsserver(4): Fix a typo in the manual page

- s/commmand/command/

MFC after: 3 days

update URL

nfsd: Fix some issues found by mandoc

- consider using OS macro: Fx

Reviewed by: bcr
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D31145

pnfsserver(4): Fix some issues reported by mandoc

- new sentence, new line

Fix a few mandoc issues

- skipping paragraph macro: Pp after Sh
- sections out of conventional order: Sh EXAMPLES
- whitespace at end of input line
- normalizing date format

Update the man page to reflect the addition of NFSv4.2 (r355677).

Update all the references to NFSv4.1, so that they apply to NFSv4.1 and
NFSv4.2. Also, change the MDS->DS mounts to use NFSv4.2, so that both
versions of the protocol can be used against the server with pNFS enabled.

This is a content change.

Fix a typo plus add a couple of sentences to pnfsserver.4.

This is a content change.

Add a man page that describes the setup of a pNFS service.

This is a content change.