man filesystems: fix xrefs after move to section 4

Reviewed by: des, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/1077

Remove $FreeBSD$: one-line nroff pattern

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

lsvfs(1): Add EXAMPLES section

Add one simple exapmle and contrast some of the information using mount(8)

PR:
Submitted by:
Reported by:
Reviewed by: gbe@, yuripv@
Approved by: manpages (bcr@)
Obtained from:
MFC after:
MFH:
Relnotes:
Security:
Sponsored by:
Differential Revision: https://reviews.freebsd.org/D27544

- Add file system type number (vfc_typenum) in the list. This is useful
for debugging when changing vfs.typenumhash configuration.
- Refactor fmt_flags().

MFC after: 1 week

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

- Import the HEAD csup code which is the basis for the cvsmode work.

spell "file system" correctly

Approved by: ru

Mechanically kill hard sentence breaks.

Uniformly refer to a file system as "file system".

Approved by: re

More consistancy. file system > filesystem

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

.Nm changes

$Id$ -> $FreeBSD$

Fixed anachronisms (nuked vfs type number; don't give a 1/6-baked list
of vfs flags in the man page).

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Fix a bunch of spelling errors in a bunch of man pages.

Print out flags as text rather than a number.

Added lsvfs command to show loaded VFS modules (including statically-linked
ones).