[ExpressionLanguage] Remove a feature that was merged into 6.2

Author: javiereguiluz

components/expression_language/syntax.rst

@@ -343,23 +343,6 @@ Ternary Operators
 * ``foo ?: 'no'`` (equal to ``foo ? foo : 'no'``)
 * ``foo ? 'yes'`` (equal to ``foo ? 'yes' : ''``)
 
-Null Coalescing Operator
-~~~~~~~~~~~~~~~~~~~~~~~~
-
-This is the same as the PHP `null-coalescing operator`_, which combines
-the ternary operator and ``isset()``. It returns the left hand-side if it exists
-and it's not ``null``; otherwise it returns the right hand-side. Note that you
-can chain multiple coalescing operators.
-
-* ``foo ?? 'no'``
-* ``foo.baz ?? 'no'``
-* ``foo[3] ?? 'no'``
-* ``foo.baz ?? foo['baz'] ?? 'no'``
-
-.. versionadded:: 6.2
-
-    The null-coalescing operator was introduced in Symfony 6.2.
-
 Built-in Objects and Variables
 ------------------------------