add versionadded

Author: Carreau

Doc/library/pdb.rst

@@ -639,9 +639,14 @@ can be overridden by the local file.
 
    Print the return value for the last return of the current function.
 
-.. versionadded:: 3.7
 .. pdbcommand:: exceptions [excnumber]
 
+   .. versionadded:: 3.13
+
+      ``exceptions [excnumber]`` command and passing exceptions by default to
+      :func:`post_mortem`.
+
+
    List or jump between chained exceptions.
 
    When using ``pdb.pm()``  or ``Pdb.post_mortem(...)`` with a chained exception