[arch-general] rc.conf man page

I threw together a man page for rc.conf based on info gleaned from the Wiki, rc.conf itself, and my own experiences. I offer it up for for adoption into the initscripts package along with comments, critcisms, and rotten tomatoes. The format is asciidoc, which is the same format used by pacman. If desirable, I'm willing to compile other pages for system config files in a similar manner. d