boards: st: stm32f429i_disc1: doc: re-work flashing section

The patch modifies the "Programming and Debugging" and "Flashing" sections
to make the documentation clearer and consistent with what is reported for
other ST boards.

Suggested-by: Abderrahmane Jarmouni <git@jarmouni.me>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>

boards/st/stm32f429i_disc1/doc/index.rst

@@ -153,6 +153,7 @@ and host OTG operation, but only device mode has been tested with Zephyr at this
 Programming and Debugging
 *************************
 
+The STM32F429I-DISC1 Discovery kit includes a ST-LINK/V2-B embedded debug tool interface.
 Applications for the ``stm32f429i_disc1`` board configuration can be built
 and flashed in the usual way (see :ref:`build_an_application` and
 :ref:`application_run` for more details).
@@ -160,12 +161,6 @@ and flashed in the usual way (see :ref:`build_an_application` and
 Flashing
 ========
 
-The STM32F429I-DISC1 Discovery kit includes a ST-LINK/V2-B embedded debug tool interface.
-This interface is supported by the openocd version included in Zephyr SDK.
-
-Flashing an application to STM32F429I-DISC1
--------------------------------------------
-
 The board is configured to be flashed using west `STM32CubeProgrammer`_ runner,
 so its :ref:`installation <stm32cubeprog-flash-host-tools>` is required.