Document 2 new sysctl's.
Document 2 new sysctl's.

Submitted by:	Ariff Abdullah <skywizard@MyBSD.org.my>
Submitted by:	Jonathan Noack <noackjr@alumni.rice.edu> (implicit)

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase