Documentation : Add missing commands for ARM-v7A & R

Change-Id: I520fed122385d4d666bf91b754b1ac196b51d471
Signed-off-by: Evan Hunter <ehunter@broadcom.com>
Reviewed-on: http://openocd.zylin.com/2875


Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
Tested-by: jenkins