Update Doc/deprecations/pending-removal-in-3.20.rst

Co-authored-by: Petr Viktorin <encukou@gmail.com>

Author: serhiy-storchaka

Doc/deprecations/pending-removal-in-3.20.rst

@@ -1,8 +1,8 @@
 Pending removal in Python 3.20
 ------------------------------
 
-* Calling the ``Struct.__new__()`` without required argument now is
-  deprecated and will be removed in Python 3.20.  Calling
+* Calling the ``__new__()`` method of :class:`struct.Struct` without the
+  *format* argument is deprecated and will be removed in Python 3.20.  Calling
   :meth:`~object.__init__` method on initialized :class:`~struct.Struct`
   objects is deprecated and will be removed in Python 3.20.