Changelog: expand conference acronym for clarity

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/ChangeLog.d/rsa-fix-priviliged-side-channel.txt b/ChangeLog.d/rsa-fix-priviliged-side-channel.txt
index f112eae..bafe18d 100644
--- a/ChangeLog.d/rsa-fix-priviliged-side-channel.txt
+++ b/ChangeLog.d/rsa-fix-priviliged-side-channel.txt
@@ -5,5 +5,6 @@
      performing a single private-key operation if the window size used for the
      exponentiation was 3 or smaller. Found and reported by Zili KOU,
      Wenjian HE, Sharad Sinha, and Wei ZHANG. See "Cache Side-channel Attacks
-     and Defenses of the Sliding Window Algorithm in TEEs" - DATE 2023.
+     and Defenses of the Sliding Window Algorithm in TEEs" - Design, Automation
+     and Test in Europe 2023.