doc(eac2): Update the RMM spec URL to EAC2

Signed-off-by: Soby Mathew <soby.mathew@arm.com>
Change-Id: I66f3a82a8b116d9dbc99869e4e03c54db0255bd8
diff --git a/docs/readme.rst b/docs/readme.rst
index 4e11b46..9a1ace1 100644
--- a/docs/readme.rst
+++ b/docs/readme.rst
@@ -107,7 +107,7 @@
 -----------------
 
 .. |Realm VM| image:: ./about/diagrams/cca_software_arch.png
-.. _Realm Management Monitor (RMM) Specification: https://developer.arm.com/documentation/den0137/1-0bet0/?lang=en
+.. _Realm Management Monitor (RMM) Specification: https://developer.arm.com/documentation/den0137/1-0eac2/?lang=en
 .. _Arm CCA: https://www.arm.com/architecture/security-features/arm-confidential-compute-architecture
 .. _Arm CCA Software Stack Guide: https://developer.arm.com/documentation/den0127/0100/Overview
 .. _TF-A: https://www.trustedfirmware.org/projects/tf-a/