Document logical xor in expression language

Author: Fan2Shrek

reference/formats/expression_language.rst

@@ -345,6 +345,10 @@ Logical Operators
 * ``not`` or ``!``
 * ``and`` or ``&&``
 * ``or`` or ``||``
+* ``xor``
+
+.. versionadded:: 7.2
+    Support for the ``xor`` logical operator was introduced in Symfony 7.2.
 
 For example::
 
@@ -489,6 +493,8 @@ The following table summarizes the operators and their associativity from the
 +-----------------------------------------------------------------+---------------+
 | ``or``, ``||``                                                  | left          |
 +-----------------------------------------------------------------+---------------+
+| ``xor``                                                         | left          |
++-----------------------------------------------------------------+---------------+
 
 Built-in Objects and Variables
 ------------------------------