Correct path in documentation

Sphinx could handle it although.
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 7dddea0..a22b94f 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -2279,7 +2279,7 @@
    -  Added an "integer" rule into the Validation library.
    -  Added valid_base64() to the Validation library.
    -  Documented clear() in the :doc:`Image
-      Processing <../libraries/image_lib>` library.
+      Processing <./libraries/image_lib>` library.
    -  Changed the behaviour of custom callbacks so that they no longer
       trigger the "required" rule.
    -  Modified Upload class $_FILES error messages to be more precise.