firmware-design.md: Fix broken link

Fix a link broken by a missing space that turned
it into a link to an non-existent anchor.

Change-Id: Ie863e963db28afa3a28b69d3f63bd7638bdf5af9
Signed-off-by: Douglas Raillard <douglas.raillard@arm.com>
This commit is contained in:
Douglas Raillard 2016-11-09 14:00:04 +00:00
parent 90d2956aea
commit b3fa89ad45