Update 2.15.7 release notes

Trigger audit for git over HTTP commands.

Change-Id: Ib88b3a9b2b612a2cc1b5613acd6ba82a8ebed9c3
diff --git a/pages/site/releases/2.15.md b/pages/site/releases/2.15.md
index 48b2f45..89d4580 100644
--- a/pages/site/releases/2.15.md
+++ b/pages/site/releases/2.15.md
@@ -436,6 +436,12 @@
   The display name was only being updated in the case when the authentication
   realm did not allow updates.
 
+* [Issue 9982](https://bugs.chromium.org/p/gerrit/issues/detail?id=9982):
+Trigger audit for git over HTTP commands.
+
+  `git-receive-pack` and `git-upload-pack` commands were only audited for
+  git over SSH.
+
 * [Issue 9974](https://bugs.chromium.org/p/gerrit/issues/detail?id=9974):
 Fix redirection to documentation index page.