Add description for info and infolist hooks

src/plugins/alias/alias-info.c

@@ -89,5 +89,6 @@ void
 alias_info_init ()
 {
     /* alias infolist hooks */
-    weechat_hook_infolist ("alias", &alias_info_get_infolist_cb, NULL);
+    weechat_hook_infolist ("alias", N_("list of alias"),
+                           &alias_info_get_infolist_cb, NULL);
 }