Update API docs for biweight_midcovariance
Update API docs for biweight_midcovariance

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