The main documentation for the command itself is in the 'west help
grep' output, so just add an entry in the list of built-in commands.
Document the extra config options as well.
Signed-off-by: Martí Bolívar <mbolivar@amperecomputing.com>
:envvar: is currently used to tag environment variables, however,
:envvar: role expects a matching .. envvar:: directive where the
environment variable is defined. This patch fixes some cases by adding
envvar directives and by converting certain cases to literals (it
doesn't make sense to document all env vars in a list, as some are
self-documented by contextual information).
Ref. https://www.sphinx-doc.org/en/master/usage/restructuredtext/
roles.html#role-envvar
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
