isDoomed too

docs/index.rst

@@ -107,8 +107,9 @@ managers have an ``explicit`` constructor keyword argument that, if
 True puts the transaction manager in explicit mode.  In explicit mode:
 
 - It is an error to call ``get()``, ``commit()``, ``abort()``,
-  ``doom()``, or ``savepoint()`` without a preceding ``begin()`` call.
-  Doing so will raise a ``NoTransaction`` exception.
+  ``doom()``, ``isDoomed``, or ``savepoint()`` without a preceding
+  ``begin()`` call.  Doing so will raise a ``NoTransaction``
+  exception.
 
 - It is an error to call ``begin()`` after a previous ``begin()``
   without an intervening ``commit()`` or ``abort()`` call.  Doing so