fix reference to extending expression language section

xabbuh · xabbuh · commit 5e1f2f499c22 · 2023-02-01T15:03:28.000+01:00
diff --git a/reference/formats/expression_language.rst b/reference/formats/expression_language.rst
@@ -186,7 +186,7 @@ This will print out ``true``.
 .. tip::
 
     To read how to register your own functions to use in an expression, see
-    ":doc:`/components/expression_language/extending`".
+    ":ref:`expression-language-extending`".
 
 .. _component-expression-arrays:
 
