doc: Fix broken external links
Using Sphinx linkcheck on the TF-A docs revealed some broken
or permanently-redirected links. These have been updated where
possible.
Change-Id: Ie1fead47972ede3331973759b50ee466264bd2ee
Signed-off-by: Paul Beesley <paul.beesley@arm.com>
diff --git a/docs/trusted-board-boot.rst b/docs/trusted-board-boot.rst
index 5ab32fe..0ef4797 100644
--- a/docs/trusted-board-boot.rst
+++ b/docs/trusted-board-boot.rst
@@ -233,6 +233,6 @@
*Copyright (c) 2015-2018, Arm Limited and Contributors. All rights reserved.*
.. _Firmware Update: firmware-update.rst
-.. _X.509 v3: http://www.ietf.org/rfc/rfc5280.txt
+.. _X.509 v3: https://tools.ietf.org/rfc/rfc5280.txt
.. _User Guide: user-guide.rst
.. _Auth Framework: auth-framework.rst