Docs: Fix Expired Links

Change-Id: I448ac91a7cfe4d3d3e8c143bcde1a18ae5724ecd
Signed-off-by: Elena Uziunaite <elena.uziunaite@arm.com>
diff --git a/docs/design_docs/booting/tfm_secure_boot.rst b/docs/design_docs/booting/tfm_secure_boot.rst
index be1928a..9cb0ced 100644
--- a/docs/design_docs/booting/tfm_secure_boot.rst
+++ b/docs/design_docs/booting/tfm_secure_boot.rst
@@ -156,7 +156,7 @@
 erased to prevent the triggering of another unnecessary image upgrade after a
 restart. The overwrite operation is fail-safe and resistant to power-cut
 failures. For more details please refer to the MCUBoot
-`documentation <https://www.mcuboot.com/mcuboot/design.html>`__.
+`documentation <https://docs.mcuboot.com/>`__.
 
 Swapping operation
 ==================
@@ -172,7 +172,7 @@
 recover the previous working firmware version after a faulty update. The swap
 operation is fail-safe and resistant to power-cut failures. For more details
 please refer to the MCUBoot
-`documentation <https://www.mcuboot.com/mcuboot/design.html>`__.
+`documentation <https://docs.mcuboot.com/>`__.
 
 .. Note::