Add pending removal

Author: sobolevn

Doc/deprecations/pending-removal-in-3.18.rst

@@ -4,6 +4,15 @@ Pending removal in Python 3.18
 * No longer accept a boolean value when a file descriptor is expected.
   (Contributed by Serhiy Storchaka in :gh:`82626`.)
 
+* :mod:`abc`
+
+   * Soft-deprecated since Python 3.3 :class:`abc.abstractclassmethod`,
+     :class:`abc.abstractstaticmethod`, and :class:`abc.abstractproperty`
+     now raise a :exc:`DeprecationWarning`.
+     These classes will be removed in Python 3.18, instead
+     use :func:`abc.abstractmethod` with :func:`classmethod`,
+     :func:`staticmethod`, and :class:`property` respectively.
+
 * :mod:`decimal`:
 
   * The non-standard and undocumented :class:`~decimal.Decimal` format