add versionadded on style.rst

Author: smnandre

console/style.rst

@@ -185,6 +185,11 @@ Content Methods
             ],
         ]);
 
+.. versionadded:: 7.3
+
+    The ``SymfonyStyle::tree()`` and the ``SymfonyStyle::createTree()`` methods
+    were introduced in Symfony 7.3.
+
 :method:`Symfony\\Component\\Console\\Style\\SymfonyStyle::createTree`
     Creates an instance of :class:`Symfony\\Component\\Console\\Helper\\TreeHelper`
     styled according to the Symfony Style Guide, which allows you to use