Update arrays.classes.rst

Reverted removing of versionchanged 2.0

Author: SMAntony

doc/source/reference/arrays.classes.rst

@@ -280,6 +280,12 @@ NumPy provides several hooks that classes can customize:
    NumPy may also call this function without a context from non-ufuncs to
    allow preserving subclass information.
 
+   .. versionchanged:: 2.0
+      ``return_scalar`` is now passed as either ``False`` (usually) or ``True``
+      indicating that NumPy would return a scalar.
+      Subclasses may ignore the value, or return ``array[()]`` to behave more
+      like NumPy.
+
    .. note::
       It is hoped to eventually deprecate this method in favour of
       func:`__array_ufunc__` for ufuncs (and :func:`__array_function__`