typo fix and minor clarification
typo fix and minor clarification

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