update docs with unit change
update docs with unit change

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