rsi: rsi_91x_sdio_ops: File headers are not good kernel-doc candidates

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

 drivers/net/wireless/rsi/rsi_91x_sdio_ops.c:24: warning: Incorrect use of kernel-doc format:  * rsi_sdio_master_access_msword() - This function sets the AHB master access
 drivers/net/wireless/rsi/rsi_91x_sdio_ops.c:32: warning: Function parameter or member 'adapter' not described in 'rsi_sdio_master_access_msword'
 drivers/net/wireless/rsi/rsi_91x_sdio_ops.c:32: warning: Function parameter or member 'ms_word' not described in 'rsi_sdio_master_access_msword'

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/20200826093401.1458456-23-lee.jones@linaro.org

drivers/net/wireless/rsi/rsi_91x_sdio_ops.c

@@ -1,4 +1,4 @@
-/**
+/*
  * Copyright (c) 2014 Redpine Signals Inc.
  *
  * Permission to use, copy, modify, and/or distribute this software for any