docs: clarify multiple UUID support in ffa manifest

If a partition supports multiple UUID, the UUID property in the list
of partition properties in the FF-A manifest must be a list or array.
Update the document to clarify the same.

Change-Id: Id13fe8dbf57a00e5cd186158270b716a4a9aedf7
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
diff --git a/docs/components/ffa-manifest-binding.rst b/docs/components/ffa-manifest-binding.rst
index 6fca245..34290f8 100644
--- a/docs/components/ffa-manifest-binding.rst
+++ b/docs/components/ffa-manifest-binding.rst
@@ -29,8 +29,9 @@
 
 - uuid [mandatory]
    - value type: <prop-encoded-array>
-   - An array consisting of 4 <u32> values, identifying the UUID of the service
-     implemented by this partition. The UUID format is described in RFC 4122.
+   - An array of comma separated tuples each consisting of 4 <u32> values,
+     identifying the UUID of the services implemented by this partition.
+     The UUID format is described in RFC 4122.
    - These 4 <u32> values are packed similar to the UUID register mapping
      specified in section '5.3 Unique Identification format', SMC Calling
      Convention, DEN0028, v1.6 G BET0