Fix Clojure layer cider-repl-mode keybindings

Clojure layer attempted to provide `C-j` and `C-k` keybindings
  to the cider-repl-mode but there was a bug.

  This fixes the bug and adds those keybindings to the documentation.

layers/+lang/clojure/README.org

@@ -32,6 +32,7 @@
     - [[#sayid-mode][sayid-mode]]
     - [[#sayid-traced-mode][sayid-traced-mode]]
     - [[#sayid-pprint][sayid-pprint]]
+    - [[#cider-repl-mode][cider-repl-mode]]
 - [[#development-notes][Development Notes]]
   - [[#indentation][Indentation]]
 
@@ -390,6 +391,13 @@ In general, ~q~ should always quit the popped up buffer.
 | ~n~         | enter next sibling node     |
 | ~p~         | enter previous sibling node |
 
+*** cider-repl-mode
+
+| Key Binding | Description    |
+|-------------+----------------|
+| ~C-j~       | next input     |
+| ~C-k~       | previous input |
+
 * Development Notes
 ** Indentation
 With a [[https://github.com/clojure-emacs/cider/blob/master/doc/indent_spec.md][new]] functionality of Cider to read the custom indentation rules from the

layers/+lang/clojure/packages.el

@@ -190,8 +190,8 @@
         "ep" 'cider-eval-print-last-sexp)
 
       (evil-define-key 'normal cider-repl-mode-map
-        "C-j" 'cider-repl-next-input
-        "C-k" 'cider-repl-previous-input)
+        (kbd "C-j") 'cider-repl-next-input
+        (kbd "C-k") 'cider-repl-previous-input)
 
       (when clojure-enable-fancify-symbols
         (clojure/fancify-symbols 'cider-repl-mode)