Issue 5754:  tweak shelve doc wording to make it clearer that even when
writeback=True values are written to the backing store when assigned to
the shelf.  Add test to confirm that this happens.  Doc patch and added
test by Robert Lehmann.  I also fixed the cross references to the sync
and close methods.
diff --git a/Misc/ACKS b/Misc/ACKS
index 0ce586e..b389f77 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -444,6 +444,7 @@
 Vincent Legoll
 Kip Lehman
 Joerg Lehmann
+Robert Lehmann
 Luke Kenneth Casson Leighton
 Marc-Andre Lemburg
 John Lenton