docs: fix incorrect label position

Author: kenjis

user_guide_src/source/libraries/validation.rst

@@ -309,8 +309,6 @@ To give a labeled error message you can set up as:
 .. literalinclude:: validation/007.php
    :lines: 2-
 
-.. _validation-withrequest:
-
 .. note:: ``setRules()`` will overwrite any rules that were set previously. To add more than one
     rule to an existing set of rules, use ``setRule()`` multiple times.
 
@@ -340,6 +338,8 @@ For example, data returned by multi select dropdown:
 .. literalinclude:: validation/011.php
    :lines: 2-
 
+.. _validation-withrequest:
+
 withRequest()
 =============