Documentation/tutorial/managing_local_additions.md: Add symlink info
Add information about how the symlink target can be used
to develop and test additions to the coreboot tree from
site-local.
Change-Id: I75f9e9575005e9ee2f255848a21c5e57c30e9e72
Signed-off-by: Nicolas Kochlowski <nickkochlowski@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84740
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Ana Carolina Cabral
Reviewed-by: Nicholas Chin <nic.c3.14@gmail.com>