Added a docstring for api_function.
Added a docstring for api_function.

henn/haas,henn/hil_sahil,apoorvemohan/haas,SahilTikale/switchHaaS,kylehogan/hil,SahilTikale/haas,henn/hil_sahil,henn/hil,kylehogan/haas,CCI-MOC/haas,kylehogan/hil,lokI8/haas,meng-sun/hil,meng-sun/hil,apoorvemohan/haas,henn/hil