Update biweight_midvariance docs
Update biweight_midvariance docs

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