fsi: fix some spelling mistakes in comment

Fix typos in comment.

Signed-off-by: Yu Zhe <yuzhe@nfschina.com>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Link: https://lore.kernel.org/r/20230203083721.23455-1-yuzhe@nfschina.com


Signed-off-by: Joel Stanley <joel@jms.id.au>