Add link to "What's New in 2.11" presentation slides

Change-Id: Id4405d3dec7f6d842066dc5f576f2f9299cb20bc
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@@ -25,6 +25,8 @@
 in Gerrit 2.11, followed by a preview of the new features coming in
 Gerrit 2.12.
 
+[Slides](https://docs.google.com/presentation/d/1xfO_qXIxO4nErjmYFlPu6eNYD82gNv9q7ce0LzeqGO8/edit?usp=sharing).
+
 *David Pursehouse, Sony Mobile*
 
 ## 10:00 am Google Store!