Describe misc updates in 2.9 release notes

Change-Id: Ia2afb05aa4d280184064762b7cc3f089b5df4c5c
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

ReleaseNotes/ReleaseNotes-2.9.txt

diff --git a/ReleaseNotes/ReleaseNotes-2.9.txt b/ReleaseNotes/ReleaseNotes-2.9.txt
index 103bc4f..0a38325 100644
--- a/ReleaseNotes/ReleaseNotes-2.9.txt
+++ b/ReleaseNotes/ReleaseNotes-2.9.txt
@@ -226,6 +226,20 @@
 Project configuration for checking of received objects].
 
 
+Misc
+~~~~
+
+* The removal of reviewers and their votes is recorded as a change
+message.
+
+* The change URL is returned on push if the change is updated.
+
+* The topic is included into merge commit messages if all merged
+changes have the same topic.
+
+* Stable CSS class names.
+
+
 Bug Fixes
 ---------