Add a missing title tag to the BIND example in the ezjail section
of the jails chapter

Approved by:	bcr (mentor)
Sponsored by:	ScaleEngine Inc.
Update to r40792:

Prefer the use of service(1) to explicit invocation of /etc/rc.d
scripts: service(1) puts things in one place and abstracts them.  Also, it's
less
typing and easier to autocomplete.

While here modernize script examples by removing the ".sh" suffix.

Submitted by:	Bjoern Heidotting
Obtained from:	The FreeBSD German Documentation Project