Fix plot directive that had an incorrect value for context option
Fix plot directive that had an incorrect value for context option

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