Update 2.16.3 release notes

Change-Id: I06d614ad7b27385d762e48b601db4875c9ea09f1
diff --git a/pages/site/releases/2.16.md b/pages/site/releases/2.16.md
index 3360636..e635640 100644
--- a/pages/site/releases/2.16.md
+++ b/pages/site/releases/2.16.md
@@ -534,6 +534,9 @@
   can fail if the blob is excessively large, but the logging of such a
   failure is improved so that the change that failed can be tracked down.
 
+* [Issue 4278](https://bugs.chromium.org/p/gerrit/issues/detail?id=4278):
+Fix wrong code snippet in email notifications.
+
 * [Issue 9410](https://bugs.chromium.org/p/gerrit/issues/detail?id=9410):
 Add the GWT hash separator to the GWT url.
 
@@ -543,7 +546,8 @@
   to be merged in existing top menu entries if they already exist. This
   was implemented in the GWT UI, but not in PolyGerrit.
 
-* Add support for several more MIME types in syntax highlighting.
+* [Issue 10267](https://bugs.chromium.org/p/gerrit/issues/detail?id=10267):
+Add support for several more MIME types in syntax highlighting.
 
   Support is added for: powershell, xquery, cmake, coffeescript, crystal, diff,
   django, dockerfile, ebnf, elm, erlang, fortran, groovy, haml, haxe, ini, julia,