Docs: Add sphinx to the documentation's "all" target

The all target really should build the expected output. At this point,
that means sphinx as well.

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: Ibbceddd013605f5f7e11707480ae2a1e5d012a91
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75498
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>

0 files changed, 0 insertions, 0 deletions