docs: update getting_started_quickly
docs: update getting_started_quickly

Update few commands and references in the Getting Started Quickly
document to make this work against the current code base.

BUG=none
TEST=none
BRANCH=none

Signed-off-by: Fabio Baltieri <1c55e39c05d9ab42261288cf330256b2af6ba179@google.com>
Change-Id: I08da587f3df85d93a51276937545984c7ad57b64
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2606227
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>
Reviewed-by: Denis Brockus <6b21e8190fb5e373363fb95271367073a16474ef@chromium.org>
Commit-Queue: Denis Brockus <6b21e8190fb5e373363fb95271367073a16474ef@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec