Document Security section of the Release Notes

Change-Id: I2b74eb994ec16f47654e84a43a066c3497caca62
Issue-ID: DOC-271
Signed-off-by: Gildas Lanilis <gildas.lanilis@huawei.com>
(cherry picked from commit a8f71f9093ad57afe14582803af8a3761ff270ea)
1 file changed