remove doctest skip
remove doctest skip

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