added some more clarification & references to the jytok equiv
added some more clarification & references to the jytok equiv

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