slight tweak to wording about IERS
slight tweak to wording about IERS

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