Fix spelling

lib.php

@@ -390,7 +390,7 @@ class course_request_hsh
         $a->fullname = fullname($user);
         $messageplain = $this->get_message_plain($a);
         $this->notify(
-            'local_hshs',
+            'local_hsh',
             $user,
             $USER,
             'courserequestapproved_hsh',