release: Update security section for 1.14.2

Add information on security vulnerabilities fixed in this release.
These CVEs are under embargo, and vulnerabilities page will be updated
when the embargo ends.

Signed-off-by: David Brown <[email protected]>

Author: d3zd3z

doc/releases/release-notes-1.14.rst

@@ -10,9 +10,20 @@ This is an LTS maintenance release with fixes.
 Security Vulnerability Related
 ******************************
 
-The following security vulnerability (CVE) was addressed in this
+The following security vulnerabilities (CVEs) were addressed in this
 release:
 
+* CVE-2020-10019
+* CVE-2020-10021
+* CVE-2020-10022
+* CVE-2020-10023
+* CVE-2020-10024
+* CVE-2020-10027
+* CVE-2020-10028
+
+More detailed information can be found in:
+https://docs.zephyrproject.org/latest/security/vulnerabilities.html
+
 Issues Fixed
 ************