Update nitrogen-96-board.rst

documentation/source/quick-start/nitrogen-96-board.rst

@@ -156,6 +156,7 @@ Debugging with GDB
 You can debug an application in the usual way. Here is an example for the Hello World application. This also requires pyOCD.
 
 .. code-block:: console
+
    From the root of the zephyr repository
    west build -b 96b_nitrogen samples/hello_world
    west debug