docs: fix discrepancies in value type of manifest fields

In order to avoid the complexity of supporting value types smaller
than u32 and avoid discrepancies for the various manifest fields
among different projects, the value type for relevant fields are
upgraded to u32.

Change-Id: Ib033019b3b8c26bf4b8b50f89b7a6d1a772e5e51
Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
diff --git a/docs/components/ffa-manifest-binding.rst b/docs/components/ffa-manifest-binding.rst
index 7761fdd..9ecdf06 100644
--- a/docs/components/ffa-manifest-binding.rst
+++ b/docs/components/ffa-manifest-binding.rst
@@ -91,10 +91,10 @@
       - 0x2: 64k
 
 - boot-order
-   - value type: <u16>
+   - value type: <u32>
    - A unique number amongst all partitions that specifies if this partition
      must be booted before others. The partition with the smaller number will be
-     booted first.
+     booted first. Highest vlue allowed for this field is 0xFFFF.
 
 - rx-tx-buffer
    - value type: "memory-regions" node
@@ -103,7 +103,7 @@
      The "compatible" must be the string "arm,ffa-manifest-rx_tx-buffer".
 
 - messaging-method [mandatory]
-   - value type: <u16>
+   - value type: <u32>
    - Specifies which messaging methods are supported by the partition, set bit
      means the feature is supported, clear bit - not supported: