Add subsection to "Releasing an affiliated package" documentation on "Modifications for a beta/release candidate release," copied and pasted from the "Release Procedures" documentation page.
Add subsection to "Releasing an affiliated package" documentation on "Modifications for a beta/release candidate release," copied and pasted from the "Release Procedures" documentation page.

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