Insert missing macro, and while I'm here change the inconsistent "page_ctl" and "pagectl" to "pgctl" to reflect ``camcontrol --help''.
Insert missing macro, and while I'm here change the inconsistent
"page_ctl" and "pagectl" to "pgctl" to reflect ``camcontrol --help''.

PR:		docs/8781
Submitted by:	Norihiro Kumagai <kuma@jp.FreeBSD.org>

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