Added info about cubic stitch and throats onto the Cubic.RST
Added info about cubic stitch and throats onto the Cubic.RST


Former-commit-id: 4569ef1e67aeb4d0b1b458d1b38736aa58ccab0e
Former-commit-id: 82bc6f64a64e9d97e1e324b079e8375c0b0c05d6
amdouglas/OpenPNM,amdouglas/OpenPNM,TomTranter/OpenPNM,stadelmanma/OpenPNM,PMEAL/OpenPNM