org.el: Add autoload cookie for `org-update-all-dblocks'.

* org.el (org-update-all-dblocks): Autoload function.

TINYCHANGE

lisp/org.el

@@ -11074,6 +11074,7 @@ Error if there is no such block at point."
       (goto-char pos)
       (error "Not in a dynamic block"))))
 
+;;;###autoload
 (defun org-update-all-dblocks ()
   "Update all dynamic blocks in the buffer.
 This function can be used in a hook."