Update whatsnew about pickle optimizations
diff --git a/Doc/whatsnew/3.2.rst b/Doc/whatsnew/3.2.rst
index 2e7deec..e5d79b6 100644
--- a/Doc/whatsnew/3.2.rst
+++ b/Doc/whatsnew/3.2.rst
@@ -562,11 +562,8 @@
(Patch by Florent Xicluna in :issue:`7622` and :issue:`7462`.)
* Serializing and unserializing data using the :mod:`pickle` module is now
- up to 4x faster, thanks to various optimizations initially contributed
- to the Unladen Swalled project.
-
- (Ported to Python 3 by Alexandre Vassalotti and Antoine Pitrou in
- :issue:`9410`)
+ several times faster. (Contributed by Alexandre Vassalotti, Antoine Pitrou
+ and the Unladen Swallow team in :issue:`9410` and :issue:`3873`.)
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