README: Fix small typos and syntax formatting
README: Fix small typos and syntax formatting

rabellamy/kalabox,ManatiCR/kalabox,RobLoach/kalabox,kalabox/kalabox-cli,rabellamy/kalabox,ManatiCR/kalabox,oneorangecat/kalabox,joshkoenig/kalabox,kalabox/kalabox-cli,joshkoenig/kalabox,ari-gold/kalabox,ari-gold/kalabox,RobLoach/kalabox,oneorangecat/kalabox