Extend installation instructions for Homebrew
Extend installation instructions for Homebrew

Closes #3055.

Signed-off-by: Roger Sheen <a61a1add71dadc74037ae5e44ee30713db9a7451@infotexture.net>

infotexture/dita-ot,dita-ot/dita-ot,shaneataylor/dita-ot,shaneataylor/dita-ot,shaneataylor/dita-ot,infotexture/dita-ot,shaneataylor/dita-ot,dita-ot/dita-ot,drmacro/dita-ot,shaneataylor/dita-ot,infotexture/dita-ot,dita-ot/dita-ot,infotexture/dita-ot,drmacro/dita-ot,drmacro/dita-ot,drmacro/dita-ot,dita-ot/dita-ot,infotexture/dita-ot,drmacro/dita-ot,dita-ot/dita-ot