doc-generator: rename 'Return' section to 'Return Type' (close #23)
doc-generator: rename 'Return' section to 'Return Type' (close #23)

cljsinfo/cljs.info,cljsinfo/cljs.info,cljsinfo/cljs.info,NPrescott/clojurescript.info,NPrescott/clojurescript.info,NPrescott/clojurescript.info