Documentation/mainboard: Add Supermicro X9SAE to index site

The Supermicro X9SAE target is supported since coreboot version 4.15.
Documentation is available in the tree, but it's not referenced from
the mainboard index page. Fix that.

Change-Id: I5d3d0b5b935f1a3ea353a3d9e39208db7c7895ef
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62449
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

0 files changed, 0 insertions, 0 deletions