add mention of helpers to branching instructions
add mention of helpers to branching instructions

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