Fixed duplicated text

Author: wouterj

setup/upgrade_major.rst

@@ -142,19 +142,6 @@ mentions of ``4.*`` to ``5.0.*``:
         },
         "...": "..."
     }
-    
-At the bottom of your ``composer.json`` file, in the ``extra`` block you can
-find a data setting for the symfony version. Make sure to also upgrade
-this one. For instance, update it to ``5.0.*`` to upgrade to Symfony 5.0:
-
-.. code-block:: json
-
-    "extra": {
-        "symfony": {
-            "allow-contrib": false,
-            "require": "5.0.*"
-        }
-    }
 
 At the bottom of your ``composer.json`` file, in the ``extra`` block you can
 find a data setting for the symfony version. Make sure to also upgrade