bpo-45104: Clarify when __init__ is called (GH-28210) (GH-28213)

(cherry picked from commit fa15df7)

Co-authored-by: Raymond Hettinger <[email protected]>

Author: miss-islington

Doc/reference/datamodel.rst

@@ -1200,7 +1200,7 @@ Basic customization
    as necessary before returning it.
 
    If :meth:`__new__` is invoked during object construction and it returns an
-   instance or subclass of *cls*, then the new instance’s :meth:`__init__` method
+   instance of *cls*, then the new instance’s :meth:`__init__` method
    will be invoked like ``__init__(self[, ...])``, where *self* is the new instance
    and the remaining arguments are the same as were passed to the object constructor.