Fix doctest
Fix doctest

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