(TK-354) Reorder metrics docs
(TK-354) Reorder metrics docs

Place Clojure metrics API docs ahead of Java API docs, since probably more
people will use the Clojure API.

puppetlabs/clj-http-client,rlinehan/clj-http-client,camlow325/clj-http-client,rlinehan/clj-http-client,puppetlabs/clj-http-client,camlow325/clj-http-client