rsi: rsi_91x_usb: Fix some basic kernel-doc issues

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

 drivers/net/wireless/rsi/rsi_91x_usb.c:26: warning: cannot understand function prototype: 'u16 dev_oper_mode = DEV_OPMODE_STA_BT_DUAL; '
 drivers/net/wireless/rsi/rsi_91x_usb.c:88: warning: Function parameter or member 'endpoint' not described in 'rsi_write_multiple'
 drivers/net/wireless/rsi/rsi_91x_usb.c:88: warning: Excess function parameter 'addr' description in 'rsi_write_multiple'
 drivers/net/wireless/rsi/rsi_91x_usb.c:320: warning: Function parameter or member 'ep_num' not described in 'rsi_rx_urb_submit'
 drivers/net/wireless/rsi/rsi_91x_usb.c:320: warning: Function parameter or member 'mem_flags' not described in 'rsi_rx_urb_submit'

Cc: Amitkumar Karwar <amitkarwar@gmail.com>
Cc: Siva Rebbagondla <siva8118@gmail.com>
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/20201102112410.1049272-3-lee.jones@linaro.org

drivers/net/wireless/rsi/rsi_91x_usb.c

-/**
+/*
  * Copyright (c) 2014 Redpine Signals Inc.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
@@ -75,7 +75,7 @@ static int rsi_usb_card_write(struct rsi_hw *adapter,
  * rsi_write_multiple() - This function writes multiple bytes of information
  *			  to the USB card.
  * @adapter: Pointer to the adapter structure.
- * @addr: Address of the register.
+ * @endpoint: Type of endpoint.
  * @data: Pointer to the data that has to be written.
  * @count: Number of multiple bytes to be written.
  *
@@ -313,6 +313,8 @@ static void rsi_rx_urb_kill(struct rsi_hw *adapter, u8 ep_num)
 /**
  * rsi_rx_urb_submit() - This function submits the given URB to the USB stack.
  * @adapter: Pointer to the adapter structure.
+ * @ep_num: Endpoint number.
+ * @mem_flags: The type of memory to allocate.
  *
  * Return: 0 on success, a negative error code on failure.
  */