Fix latex in blackbody doc for proper rendering
Fix latex in blackbody doc for proper rendering

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