DOC: document inputs to stat funcs
DOC: document inputs to stat funcs

DougBurke/astropy,dhomeier/astropy,larrybradley/astropy,bsipocz/astropy,bsipocz/astropy,saimn/astropy,MSeifert04/astropy,lpsinger/astropy,mhvk/astropy,funbaker/astropy,pllim/astropy,mhvk/astropy,stargaser/astropy,bsipocz/astropy,mhvk/astropy,saimn/astropy,aleksandr-bakanov/astropy,stargaser/astropy,aleksandr-bakanov/astropy,saimn/astropy,aleksandr-bakanov/astropy,saimn/astropy,MSeifert04/astropy,bsipocz/astropy,DougBurke/astropy,pllim/astropy,lpsinger/astropy,astropy/astropy,funbaker/astropy,lpsinger/astropy,pllim/astropy,funbaker/astropy,astropy/astropy,lpsinger/astropy,saimn/astropy,aleksandr-bakanov/astropy,astropy/astropy,dhomeier/astropy,pllim/astropy,larrybradley/astropy,dhomeier/astropy,lpsinger/astropy,mhvk/astropy,StuartLittlefair/astropy,MSeifert04/astropy,DougBurke/astropy,larrybradley/astropy,DougBurke/astropy,larrybradley/astropy,StuartLittlefair/astropy,dhomeier/astropy,astropy/astropy,MSeifert04/astropy,dhomeier/astropy,larrybradley/astropy,stargaser/astropy,funbaker/astropy,StuartLittlefair/astropy,astropy/astropy,StuartLittlefair/astropy,stargaser/astropy,pllim/astropy,StuartLittlefair/astropy,mhvk/astropy