Add missing generated option

Author: alexander-schranz

docs/en/reference/basic-mapping.rst

@@ -239,6 +239,7 @@ Here is a complete list of ``Column``s attributes (all optional):
 - ``nullable`` (default: ``false``): Whether the column is nullable.
 - ``insertable`` (default: ``true``): Whether the column should be inserted.
 - ``updatable`` (default: ``true``): Whether the column should be updated.
+- ``generated`` (default: ``null``): Whether the generated strategy should be ``'NEVER'``, ``'INSERT'`` and ``ALWAYS``.
 - ``enumType`` (requires PHP 8.1 and ``doctrine/orm`` 2.11): The PHP enum class name to convert the database value into.
 - ``precision`` (default: 0): The precision for a decimal (exact numeric) column
   (applies only for decimal column),