Fix up emacs typos

editors/emacs/README.md

@@ -4,5 +4,5 @@ Add this to your init:
 (require 'prettier-js)
 (add-hook 'js-mode-hook
           (lambda ()
-            (add-hook 'before-save-hook 'jscodefmt-before-save)))
+            (add-hook 'before-save-hook 'prettier-before-save)))
 ```

editors/emacs/prettier-js.el

@@ -62,7 +62,7 @@ a `before-save-hook'."
 ;;;###autoload
 (defun prettier-before-save ()
   "Add this to .emacs to run refmt on the current buffer when saving:
- (add-hook 'before-save-hook 'refmt-before-save)."
+ (add-hook 'before-save-hook 'prettier-before-save)."
   (interactive)
   (when (eq major-mode 'js-mode) (prettier)))