Update doc/nrf/app_dev/device_guides/nrf54h/ug_nrf54h20_ironside.rst

Co-authored-by: Francesco Domenico Servidio <[email protected]>

Author: hakonfam

doc/nrf/app_dev/device_guides/nrf54h/ug_nrf54h20_ironside.rst

@@ -828,9 +828,8 @@ SDROM verifies and copies the update candidate specified through these registers
 |ISE| exposes an update service that allows local domains to trigger the update process by indirectly writing to the relevant SICR registers.
 
 .. note::
-   The update data needs to be placed within a valid memory range.
-   See ``nrf_ironside/update.h`` for more details.
-
+   The update data must be placed within a valid memory range.
+   See :file:`nrf_ironside/update.h` for more details.
 
 The release ZIP archive for |ISE| includes the following components: