Add several kernel-doc headers. Declare input arrays const. Specify the
array size in function declarations.

Link: https://lore.kernel.org/r/20220421183023.3462291-2-bvanassche@acm.orgReviewed-by: NDamien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Acked-by: NDouglas Gilbert <dgilbert@interlog.com>
Signed-off-by: NBart Van Assche <bvanassche@acm.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>