Mention cider-find-ns in the menus for cider-mode and cider-repl-mode

Author: bbatsov

cider-mode.el

@@ -268,6 +268,7 @@ Configure `cider-cljs-*-repl' to change the ClojureScript REPL to use for your b
     ,cider-doc-menu
     ("Find (jump to)"
      ["Find definition" cider-find-var]
+     ["Find namespace" cider-find-ns]
      ["Find resource" cider-find-resource]
      ["Find keyword" cider-find-keyword]
      ["Go back" cider-pop-back])

cider-repl.el

@@ -1487,6 +1487,7 @@ constructs."
         "--"
         ("Find"
          ["Find definition" cider-find-var]
+         ["Find namespace" cider-find-ns]
          ["Find resource" cider-find-resource]
          ["Find keyword" cider-find-keyword]
          ["Go back" cider-pop-back])