wl3501_cs: Fix misspelling and provide missing documentation

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

 In file included from drivers/net/wireless/wl3501_cs.c:57:
 drivers/net/wireless/wl3501_cs.c:143: warning: Function parameter or member 'reg_domain' not described in 'iw_valid_channel'
 drivers/net/wireless/wl3501_cs.c:143: warning: Excess function parameter 'reg_comain' description in 'iw_valid_channel'
 drivers/net/wireless/wl3501_cs.c:469: warning: Function parameter or member 'data' not described in 'wl3501_send_pkt'
 drivers/net/wireless/wl3501_cs.c:469: warning: Function parameter or member 'len' not described in 'wl3501_send_pkt'

Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Fox Chen <mhchen@golf.ccl.itri.org.tw>
Cc: de Melo <acme@conectiva.com.br>
Cc: Gustavo Niemeyer <niemeyer@conectiva.com>
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/20201102112410.1049272-25-lee.jones@linaro.org

drivers/net/wireless/wl3501_cs.c

@@ -134,7 +134,7 @@ static const struct {
 
 /**
  * iw_valid_channel - validate channel in regulatory domain
- * @reg_comain: regulatory domain
+ * @reg_domain: regulatory domain
  * @channel: channel to validate
  *
  * Returns 0 if invalid in the specified regulatory domain, non-zero if valid.
@@ -458,11 +458,9 @@ static int wl3501_pwr_mgmt(struct wl3501_card *this, int suspend)
 /**
  * wl3501_send_pkt - Send a packet.
  * @this: Card
- *
- * Send a packet.
- *
- * data = Ethernet raw frame.  (e.g. data[0] - data[5] is Dest MAC Addr,
+ * @data: Ethernet raw frame.  (e.g. data[0] - data[5] is Dest MAC Addr,
  *                                   data[6] - data[11] is Src MAC Addr)
+ * @len: Packet length
  * Ref: IEEE 802.11
  */
 static int wl3501_send_pkt(struct wl3501_card *this, u8 *data, u16 len)