doc: Documentation issue in 'develop/getting_started/index', No command west boards

[ssnover]

Describe the bug
Under "Build the Blinky Sample", the documentation calls out using the command west boards in order to obtain a list of boards supported by Zephyr. However, west does not appear to support that command:

(.venv) ssnover@pop-os:~/.local/opt/zephyr-sdk-0.16.4$ west boards
usage: west [-h] [-z ZEPHYR_BASE] [-v] [-V] <command> ...
west: unknown command "boards"; do you need to run this inside a workspace?

Running west --help shows a list of commands, but also notes that:

Cannot load extension commands; help for them is not available.
(To debug, try: "west manifest --validate".)

The fix became clear when I switched to the workspace directory created earlier. I'd suggest clarifying the docs here to mention that this command must be run inside a specific directory tree. (Perhaps in or beneath the top level directory containing .west?)

Environment

• Page: develop/getting_started/index
• Version: main
• SHA-1: e910409

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[kartben]

Closing as won't fix as it's unlikely (but of course possible, but less so IMO now that SDK is "magically" installed by west sdk without leaving the workspace) that the user would not be within the workspace by the time they reach this step in the getting started guide