update doctests for constants
update doctests for constants

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