Deal with some Py2/Py3 differences :(

doc/guide/transactions-and-threading.rst

@@ -320,12 +320,12 @@ transaction::
       savepoint.rollback()
 
   with db.transaction() as conn:
-      print(conn.root.x, conn.root.y) # prints 1 0
+      print([conn.root.x, conn.root.y]) # prints 1 0
 
 .. -> src
 
    >>> exec(src)
-   1 0
+   [1, 0]
 
 If we executed this code, it would print 1 and 0, because while the
 initial changes were committed, the changes in the savepoint were

src/ZODB/tests/testdocumentation.py

@@ -40,7 +40,9 @@ def test_suite():
 
     return unittest.TestSuite((
         manuel.testing.TestSuite(
-            manuel.doctest.Manuel() + manuel.capture.Manuel(),
+            manuel.doctest.Manuel(
+                optionflags=doctest.IGNORE_EXCEPTION_DETAIL,
+                ) + manuel.capture.Manuel(),
             join(guide, 'writing-persistent-objects.rst'),
             join(guide, 'install-and-run.rst'),
             join(guide, 'transactions-and-threading.rst'),