L.Cross: clarify documentation
L.Cross: clarify documentation

Amend-record earlier patch to work with byorgey's fix,
this one is just the documentation typo fixes and 
clarifications.

f1u77y/xmonad-contrib,CaptainPatate/xmonad-contrib,xmonad/xmonad-contrib,CaptainPatate/xmonad-contrib,mathstuf/xmonad-contrib,mathstuf/xmonad-contrib,CaptainPatate/xmonad-contrib,ohlus/xmonad-contrib,ohlus/xmonad-contrib,xmonad/xmonad-contrib,f1u77y/xmonad-contrib,mathstuf/xmonad-contrib,0/xmonad-contrib,0/xmonad-contrib,ohlus/xmonad-contrib,0/xmonad-contrib,pjones/xmonad-test