Fix docstring typo

* lisp/org.el (org-mode-map): Fix typo.

TINYCHANGE

lisp/org-keys.el

@@ -218,7 +218,7 @@
 ;;; Variables
 
 (defvar org-mode-map (make-sparse-keymap)
-  "Keymap fo Org mode.")
+  "Keymap for Org mode.")
 
 (defvaralias 'org-CUA-compatible 'org-replace-disputed-keys)