DOC: discuss optional parameters in narrative docs
DOC: discuss optional parameters in narrative docs

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