manual: fix all overfull and underfull hboxes

Change-Id: Id84f16de5a3d1907e196d13007a312593bb6670a
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/2769


Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>