Add comment explaining 'info' test in Quantity.__setitem__ [skip ci]
Add comment explaining 'info' test in Quantity.__setitem__ [skip ci]

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