Finishing docstrings onP2P_gpu and P2PKt_gpu in FMMutils.py
Finishing docstrings onP2P_gpu and P2PKt_gpu in FMMutils.py


Former-commit-id: 272c1522753a6e27095b6402f41508708aa8c657
barbagroup/pygbe,barbagroup/pygbe,barbagroup/pygbe