fix docstring
fix docstring

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