fix(doc): update MPU VA and PA configuration description

Signed-off-by: Diogo Costa <[email protected]>

source/bao_hyp/config.rst

@@ -365,7 +365,8 @@ where:
 .. note::
   It is mandatory for ``base`` and ``size`` to align with the smallest page size of the
   architecture. For MMU systems, this typically aligns to 4K, while for MPU systems, it aligns to
-  64 bytes. Please note that for MPU systems there is no virtual address (VA).
+  64 bytes. Please note that for MPU systems, the virtual address (``va``) must match the physical
+  address (``pa``).
 
 - ``interrupt_num`` [optional] - corresponds to the number of interrupts generated by the device to
   the VM. By default, ``interrupt_num`` equals to 0;