doc: board: toradex: fix verdin module output

Fix the Verdin module output which was missing white space for correct
rendering.

While at it also leave product links, add section author also for the
Verdin iMX8M Mini and Plus, and add a missing CROSS_COMPILE export for
the Verdin iMX8M Mini.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Nishanth Menon <nm@ti.com> #verdin-am62
Reviewed-by: Tom Rini <trini@konsulko.com>