skip the same doctests in galactocentric docs page
skip the same doctests in galactocentric docs page

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