stlinkv3_spi.c: Improve printed messages

Add missing line ends, and add a note about the first version of the
updater which contains the necessary V3 bridge feature.

Change-Id: Ib45efa37b192489bdfe26f1f0fd1d81035a08c70
Signed-off-by: Miklós Márton <martonmiklosqdev@gmail.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/43900
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
1 file changed