add velocity examples to whatsnew
add velocity examples to whatsnew

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