Add docs explanation of why multi-column assignment fails silently
Add docs explanation of why multi-column assignment fails silently

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