Fixed Yaml syntax

BenjaminPaap · BenjaminPaap · commit 368576b9aeb6 · 2015-10-19T08:27:10.000+02:00
diff --git a/reference/constraints/Url.rst b/reference/constraints/Url.rst
@@ -339,8 +339,7 @@ DNS check failed.
         AppBundle\Entity\Author:
             properties:
                 bioUrl:
-                    - Url:
-                        dnsMessage: 'The host "{{ value }}" could not be resolved.'
+                    - Url: { dnsMessage: 'The host "{{ value }}" could not be resolved.' }
 
     .. code-block:: xml
 
