updated utils docs to better reflect reality
updated utils docs to better reflect reality

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