Fix documentations

Author: taku0

swift-mode-font-lock.el

@@ -56,7 +56,7 @@
 
 (defface swift-mode:constant-keyword-face
   '((t . (:inherit font-lock-constant-face)))
-  "Face for highlighting constant keywords
+  "Face for highlighting constant keywords.
 
 That is, true, false, and nil."
   :group 'swift-mode:faces)

swift-mode-repl.el

@@ -214,7 +214,8 @@ START and END define region within current buffer"
 (define-derived-mode swift-repl-mode comint-mode "Swift REPL"
   "Major mode for interacting with Swift REPL.
 
-A REPL can be fired up with M-x swift-mode:run-repl or M-x run-swift.
+A REPL can be fired up with \\<swift-mode-map>\\[swift-mode:run-repl] or \
+\\<swift-mode-map>\\[run-swift].
 
 Customization: Entry to this mode runs the hooks on `comint-mode-hook' and
 `swift-repl-mode-hook' (in that order).