Documentation: bus: ti-sysc: fix spelling mistakes "multipe" and "interconnet"

There is are a couple of spelling mistakes in the Documentation. Fix them.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>