docs: getting_started: add note about west boards command

Add note about west boards command to getting started documentation,
to make it easier for users to determine the name of their board when used
with west. Also change "-p auto" to "-p always" in the build step, since
this is more deterministic

Signed-off-by: Daniel DeGrasse <[email protected]>

Author: danieldegrasse

doc/develop/getting_started/index.rst

@@ -648,6 +648,9 @@ Build the Blinky Sample
    does not meet Blinky's :ref:`blinky-sample-requirements`, then
    :ref:`hello_world` is a good alternative.
 
+   If you are unsure what name west uses for your board, ``west boards``
+   can be used to obtain a list of all boards Zephyr supports.
+
 Build the :ref:`blinky-sample` with :ref:`west build <west-building>`, changing
 ``<your-board-name>`` appropriately for your board:
 
@@ -658,24 +661,26 @@ Build the :ref:`blinky-sample` with :ref:`west build <west-building>`, changing
       .. code-block:: bash
 
          cd ~/zephyrproject/zephyr
-         west build -p auto -b <your-board-name> samples/basic/blinky
+         west build -p always -b <your-board-name> samples/basic/blinky
 
    .. group-tab:: macOS
 
       .. code-block:: bash
 
          cd ~/zephyrproject/zephyr
-         west build -p auto -b <your-board-name> samples/basic/blinky
+         west build -p always -b <your-board-name> samples/basic/blinky
 
    .. group-tab:: Windows
 
       .. code-block:: bat
 
          cd %HOMEPATH%\zephyrproject\zephyr
-         west build -p auto -b <your-board-name> samples\basic\blinky
+         west build -p always -b <your-board-name> samples\basic\blinky
 
-The ``-p auto`` option automatically cleans byproducts from a previous build
-if necessary, which is useful if you try building another sample.
+The ``-p always`` option forces a pristine build, and is recommended for new
+users. Users may also use the ``-p auto`` option, which will use
+heuristics to determine if a pristine build is required, such as when building
+another sample.
 
 .. rst-class:: numbered-step