add note about velocities to main coordinate page
add note about velocities to main coordinate page

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