doc: build: update description of build dependencies for Alpine Linux

Signed-off-by: Milan P. Stanić <mps@arvanta.net>
Reviewed-by: Simon Glass <sjg@chromium.org>

Reformat and keep ncurses-dev needed for 'make menuconfig'
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
1 file changed