Update description for user x-parameters parameter.
Update description for user x-parameters parameter.

nzlosh/st2,Plexxi/st2,nzlosh/st2,Plexxi/st2,StackStorm/st2,StackStorm/st2,nzlosh/st2,Plexxi/st2,Plexxi/st2,StackStorm/st2,tonybaloney/st2,tonybaloney/st2,StackStorm/st2,nzlosh/st2,tonybaloney/st2