man filesystems: move driver pages to section four

Filesystem manual pages describe drivers, not formats;
except for fs, which describes the structures of ffs/ufs,
not how to use it in the system.

man filesystems: move driver pages to section four

Filesystem manual pages describe drivers, not formats;
except for fs, which describes the structures of ffs/ufs,
not how to use it in the system.

Reported by: emaste
Reviewed by: des, imp, meena (previous version)
Pull Request: https://github.com/freebsd/freebsd-src/pull/1077

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Remove $FreeBSD$: two-line nroff pattern

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

nullfs.5: Add an example fstab(5) entry

Some other file system manual pages like msdosfs(5) feature similar
examples as well.

MFC after: 1 week

Fix a rendering issue in the nullfs(5) manual page.

MFC after: 3 days
Sponsored by: The FreeBSD Foundation

use .Mt to mark up email addresses consistently (part6)

PR: 191174
Submitted by: Franco Fichtner <franco at lastsummer.de>

Add initial version of the nullfs(5) man page

MFC after: 3 days