Docs: Document RSS provisioning and key management

Change-Id: I078a740a07b9d0d580f15eaa0dcaf977d9b7e987
Signed-off-by: Raef Coles <raef.coles@arm.com>
diff --git a/docs/platform/arm/rss/index.rst b/docs/platform/arm/rss/index.rst
index a6ff830..63ec126 100644
--- a/docs/platform/arm/rss/index.rst
+++ b/docs/platform/arm/rss/index.rst
@@ -7,6 +7,8 @@
 
     RSS introduction <readme.rst>
     RSS communication design <rss_comms.rst>
+    RSS hardware key management <rss_key_management.rst>
+    RSS provisioning <rss_provisioning.rst>
 
 RSS also includes the following extra partitions: