docstrings for coherence_function_g1 and coherence_function_g2
docstrings for coherence_function_g1 and coherence_function_g2

anubhavvardhan/qutip,anubhavvardhan/qutip,zasdfgbnm/qutip,cgranade/qutip,qutip/qutip,cgranade/qutip,qutip/qutip,zasdfgbnm/qutip