bpo-38493: Add os.CLD_KILLED and os.CLD_STOPPED. (GH-16821)

diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index fe9531b..8e9d9e6 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -3946,8 +3946,10 @@
 
 
 .. data:: CLD_EXITED
+          CLD_KILLED
           CLD_DUMPED
           CLD_TRAPPED
+          CLD_STOPPED
           CLD_CONTINUED
 
    These are the possible values for :attr:`si_code` in the result returned by
@@ -3957,6 +3959,9 @@
 
    .. versionadded:: 3.3
 
+   .. versionchanged:: 3.9
+      Added :data:`CLD_KILLED` and :data:`CLD_STOPPED` values.
+
 
 .. function:: waitpid(pid, options)