(doc load-namespace) doesn't display anything.
Implementation guidance:
The arglists and doc should be added here https://github.com/clojure/clojurescript/blob/73272a2da45a4c69d090800fa7732abe3fd05c70/src/main/clojure/cljs/repl.cljc#L1402
The REPL special is set up here https://github.com/clojure/clojurescript/blob/73272a2da45a4c69d090800fa7732abe3fd05c70/src/main/clojure/cljs/repl.cljc#L783
and delegates to this function, which could be used as source material for forming a docstring
https://github.com/clojure/clojurescript/blob/73272a2da45a4c69d090800fa7732abe3fd05c70/src/main/clojure/cljs/repl.cljc#L234
Testing this REPL special seems to show it doesn't work. If that's actually the case, perhaps this ticket could be re-evaluated and instead of documenting it, it could be removed.