Updated cosmology docs for new WAMP9 default
Updated cosmology docs for new WAMP9 default

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