iio: accel: sca3000: Fix 2 misspellings and demote nonconforming kerneldocs

iio: accel: sca3000: Fix 2 misspellings and demote nonconforming kerneldocs

Fixes the following W=1 kernel build warning(s):

 drivers/iio/accel/sca3000.c:210: warning: Function parameter or member 'mot_det_mult_xz' not described in 'sca3000_chip_info'
 drivers/iio/accel/sca3000.c:210: warning: Function parameter or member 'mot_det_mult_y' not described in 'sca3000_chip_info'
 drivers/iio/accel/sca3000.c:871: warning: Function parameter or member 'indio_dev' not described in 'sca3000_read_event_value'
 drivers/iio/accel/sca3000.c:871: warning: Function parameter or member 'chan' not described in 'sca3000_read_event_value'
 drivers/iio/accel/sca3000.c:871: warning: Function parameter or member 'type' not described in 'sca3000_read_event_value'
 drivers/iio/accel/sca3000.c:871: warning: Function parameter or member 'dir' not described in 'sca3000_read_event_value'
 drivers/iio/accel/sca3000.c:871: warning: Function parameter or member 'info' not described in 'sca3000_read_event_value'
 drivers/iio/accel/sca3000.c:871: warning: Function parameter or member 'val' not described in 'sca3000_read_event_value'
 drivers/iio/accel/sca3000.c:871: warning: Function parameter or member 'val2' not described in 'sca3000_read_event_value'
 drivers/iio/accel/sca3000.c:1110: warning: Function parameter or member 'indio_dev' not described in 'sca3000_read_event_config'
 drivers/iio/accel/sca3000.c:1110: warning: Function parameter or member 'chan' not described in 'sca3000_read_event_config'
 drivers/iio/accel/sca3000.c:1110: warning: Function parameter or member 'type' not described in 'sca3000_read_event_config'
 drivers/iio/accel/sca3000.c:1110: warning: Function parameter or member 'dir' not described in 'sca3000_read_event_config'

Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>