boards: shields: mikroe_adc_click: use board with mikroBUS as example

Use a board with a mikroBUS as example in the shield documentation and
update the example application since the board_shell sample was removed in
commit 7c85f4b.

Fixes: #67134

Signed-off-by: Henrik Brix Andersen <[email protected]>

Author: henrikbrixandersen

boards/shields/mikroe_adc_click/doc/index.rst

@@ -35,8 +35,8 @@ Set ``-DSHIELD=mikro_adc_click`` when you invoke ``west build``. For
 example:
 
 .. zephyr-app-commands::
-   :zephyr-app: test/boards/board_shell
-   :board: frdm_k64f
+   :zephyr-app: <my_app>
+   :board: lpcxpresso55s16
    :shield: mikroe_adc_click
    :goals: build