Docs: Fix broken links in documentation files

Signed-off-by: Awadhy Mohammed <awadhy.mohammed@arm.com>
Change-Id: I29906e6e212f285fc33825689a349fd790ddddea
diff --git a/docs/security/index.rst b/docs/security/index.rst
index 736c799..a51dacb 100644
--- a/docs/security/index.rst
+++ b/docs/security/index.rst
@@ -45,7 +45,7 @@
 TF-M policy is to credit the contributor's name in the published security advisory.
 
 .. _issue tracker: https://developer.trustedfirmware.org/project/view/2/
-.. _mailing list: https://lists.trustedfirmware.org/mailman/listinfo/tf-m
+.. _mailing list: https://lists.trustedfirmware.org/mailman3/lists/tf-m.lists.trustedfirmware.org/
 .. _TrustedFirmware.org security incident process: https://developer.trustedfirmware.org/w/collaboration/security_center/
 .. _Security Incident Process: https://developer.trustedfirmware.org/w/collaboration/security_center/reporting/