- add a note regarding pkg-search

Differential Revision:	https://reviews.freebsd.org/D1136
Approved by:	wblock (mentor)
- fix formatting for SourceForge, and point out FreeBSD site to check
for ports

Differential Revision:	https://reviews.freebsd.org/D1156
Approved by:	wblock (mentor)
- update tuning for jails

https://lists.freebsd.org/pipermail/freebsd-doc/2014-November/024540.html

Differential Revision:		https://reviews.freebsd.org/D1135
Submitted by:	cedric@synapse-interactive.fr (mailing-list note)
Approved by:	wblock (mentor)