 Fix JPL ephemerides format extension in docs
 Fix JPL ephemerides format extension in docs

[ci skip]
aleksandr-bakanov/astropy,MSeifert04/astropy,lpsinger/astropy,astropy/astropy,saimn/astropy,larrybradley/astropy,lpsinger/astropy,pllim/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,astropy/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,DougBurke/astropy,mhvk/astropy,stargaser/astropy,lpsinger/astropy,bsipocz/astropy,astropy/astropy,pllim/astropy,astropy/astropy,dhomeier/astropy,saimn/astropy,saimn/astropy,bsipocz/astropy,mhvk/astropy,dhomeier/astropy,StuartLittlefair/astropy,larrybradley/astropy,pllim/astropy,lpsinger/astropy,dhomeier/astropy,bsipocz/astropy,stargaser/astropy,funbaker/astropy,larrybradley/astropy,DougBurke/astropy,larrybradley/astropy,larrybradley/astropy,funbaker/astropy,pllim/astropy,dhomeier/astropy,stargaser/astropy,DougBurke/astropy,mhvk/astropy,stargaser/astropy,MSeifert04/astropy,saimn/astropy,MSeifert04/astropy,mhvk/astropy,mhvk/astropy,aleksandr-bakanov/astropy,pllim/astropy,lpsinger/astropy,funbaker/astropy,aleksandr-bakanov/astropy,DougBurke/astropy,StuartLittlefair/astropy,MSeifert04/astropy,dhomeier/astropy,astropy/astropy,funbaker/astropy,bsipocz/astropy,saimn/astropy