Fix samples in README.rst
Fix samples in README.rst

Fix incorrect formatting of cli samples.

Change-Id: I1e2d9efe6b67d7ec535d4f1f4aa6380c9c440aa1

paboldin/rally,yeming233/rally,openstack/rally,redhat-openstack/rally,openstack/rally,gluke77/rally,paboldin/rally,gluke77/rally,shdowofdeath/rally,yeming233/rally,pandeyop/rally,amit0701/rally,vefimova/rally,openstack/rally,vganapath/rally,pandeyop/rally,varunarya10/rally,aplanas/rally,eonpatapon/rally,pyKun/rally,group-policy/rally,pyKun/rally,group-policy/rally,eonpatapon/rally,vganapath/rally,cernops/rally,vganapath/rally,group-policy/rally,eayunstack/rally,afaheem88/rally,go-bears/rally,aforalee/RRally,vponomaryov/rally,aplanas/rally,amit0701/rally,shdowofdeath/rally,amit0701/rally,ytsarev/rally,openstack/rally,vponomaryov/rally,paboldin/rally,vganapath/rally,gluke77/rally,gluke77/rally,redhat-openstack/rally,ytsarev/rally,go-bears/rally,eayunstack/rally,afaheem88/rally,vefimova/rally,cernops/rally,varunarya10/rally,aforalee/RRally,eayunstack/rally