Clarify handling of unit if data is Quantity
Clarify handling of unit if data is Quantity

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