Add doc string to test [skip ci]
Add doc string to test [skip ci]

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