v2.16.6 release notes, add Issue 10505

Change-Id: I584d9f11adf89cd9662162a26cae15d0e64f91c8
diff --git a/pages/site/releases/2.16.md b/pages/site/releases/2.16.md
index 17309b1..26bb861 100644
--- a/pages/site/releases/2.16.md
+++ b/pages/site/releases/2.16.md
@@ -546,7 +546,10 @@
 Fix faulty relative URLs for change weblinks.
 
 * [Issue 10355](https://bugs.chromium.org/p/gerrit/issues/detail?id=10355):
-Show all change-weblinks considered "code browser" weblinks,
+Show all change-weblinks considered "code browser" weblinks.
+
+* [Issue 10505](https://bugs.chromium.org/p/gerrit/issues/detail?id=10505):
+Show border at 72 chars for commit messages in side-by-side view.
 
 * Fix error in plugin loading.