[#3568] document show_awards_banner option.  Specify defaults for others
[#3568] document show_awards_banner option.  Specify defaults for others

apache/incubator-allura,lym/allura-git,apache/allura,apache/incubator-allura,leotrubach/sourceforge-allura,heiths/allura,Bitergia/allura,heiths/allura,apache/incubator-allura,Bitergia/allura,apache/allura,leotrubach/sourceforge-allura,leotrubach/sourceforge-allura,heiths/allura,leotrubach/sourceforge-allura,lym/allura-git,apache/allura,apache/allura,lym/allura-git,apache/allura,Bitergia/allura,lym/allura-git,heiths/allura,Bitergia/allura,heiths/allura,lym/allura-git,apache/incubator-allura,Bitergia/allura