tweak missing namespace message

Author: swannodette

src/main/clojure/cljs/analyzer.cljc

@@ -306,7 +306,7 @@
   (str "No such namespace: " ns-sym
        ", could not locate " (ns->relpath ns-sym :cljs)
        ", " (ns->relpath ns-sym :cljc)
-       ", or JavaScript providing \"" js-provide "\""))
+       ", or JavaScript source providing \"" js-provide "\""))
 
 (defmethod error-message :undeclared-macros-ns
   [warning-type {:keys [ns-sym js-provide] :as info}]