lockdown: Remove dead link to old documentation
diff --git a/include/libimobiledevice/lockdown.h b/include/libimobiledevice/lockdown.h
index e01bf58..076fa9d 100644
--- a/include/libimobiledevice/lockdown.h
+++ b/include/libimobiledevice/lockdown.h
@@ -331,8 +331,6 @@
  * The ActivationRecord plist dictionary must be obtained using the
  * activation protocol requesting from Apple's https webservice.
  *
- * @see http://iphone-docs.org/doku.php?id=docs:protocols:activation
- *
  * @param client The lockdown client
  * @param activation_record The activation record plist dictionary
  *