zd1211rw: zd_chip: Fix formatting

Kerneldoc expects attributes/parameters to be in '@*.: ' format and
gets confused if the variable does not follow the type/attribute
definitions.

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

 drivers/net/wireless/zydas/zd1211rw/zd_chip.c:1385: warning: Function parameter or member 'rx_frame' not described in 'zd_rx_rate'
 drivers/net/wireless/zydas/zd1211rw/zd_chip.c:1385: warning: Function parameter or member 'status' not described in 'zd_rx_rate'

Cc: Daniel Drake <dsd@gentoo.org>
Cc: Ulrich Kunitz <kune@deine-taler.de>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200826093401.1458456-10-lee.jones@linaro.org

drivers/net/wireless/zydas/zd1211rw/zd_chip.c

@@ -1375,8 +1375,8 @@ static inline u8 zd_rate_from_ofdm_plcp_header(const void *rx_frame)
 
 /**
  * zd_rx_rate - report zd-rate
- * @rx_frame - received frame
- * @rx_status - rx_status as given by the device
+ * @rx_frame: received frame
+ * @rx_status: rx_status as given by the device
  *
  * This function converts the rate as encoded in the received packet to the
  * zd-rate, we are using on other places in the driver.