Update 2.8.2 release notes

Change-Id: I120587908d05e61a87c6058a481c6085f9586c3e
diff --git a/ReleaseNotes/ReleaseNotes-2.8.2.txt b/ReleaseNotes/ReleaseNotes-2.8.2.txt
index f3f1741..98a4ea7 100644
--- a/ReleaseNotes/ReleaseNotes-2.8.2.txt
+++ b/ReleaseNotes/ReleaseNotes-2.8.2.txt
@@ -130,6 +130,13 @@
 scores, use `upsert` to record them all at the same time, rather than in
 separate `update` and `insert` operations.
 
+* link:https://code.google.com/p/gerrit/issues/detail?id=2374[Issue 2374]:
+Prevent duplicate commits in same project when uploading to `refs/changes/n`.
++
+Under certain circumstances, when pushing to `refs/changes/n`, the same
+commit could be pushed onto multiple changes even if the changes were on the
+same branch.
+
 * Remove dependency on joda time library in gerrit launcher.
 +
 The joda time library was being unnecessarily packaged in the root of