Update 3.10 release notes for Java 11 news

Change-Id: If0cf28935bf9c48c8e01408765aca9fceab87eb0
diff --git a/pages/site/releases/3.10.md b/pages/site/releases/3.10.md
index b5fb81b..7532220 100644
--- a/pages/site/releases/3.10.md
+++ b/pages/site/releases/3.10.md
@@ -12,6 +12,12 @@
 
 ## Release highlights
 
+### Dropped support for Java 11
+
+Java 11 is EOL since September 2023 and Gerrit already supports Java 17.
+Support for building Gerrit with Java 11 has been dropped and the default
+minimum version set to Java 17.
+
 ### Rebase merge commits
 
 It's now possible to rebase merge commits directly from the UI.