iwlwifi: dvm: scan: Demote a few nonconformant kernel-doc headers

2 of which do not attempt to document their parameters, 1 does a poor job.

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

 drivers/net/wireless/intel/iwlwifi/dvm/scan.c:193: warning: Function parameter or member 'priv' not described in 'iwl_scan_cancel'
 drivers/net/wireless/intel/iwlwifi/dvm/scan.c:205: warning: Function parameter or member 'priv' not described in 'iwl_scan_cancel_timeout'
 drivers/net/wireless/intel/iwlwifi/dvm/scan.c:570: warning: Function parameter or member 'frame' not described in 'iwl_fill_probe_req'
 drivers/net/wireless/intel/iwlwifi/dvm/scan.c:570: warning: Function parameter or member 'ta' not described in 'iwl_fill_probe_req'
 drivers/net/wireless/intel/iwlwifi/dvm/scan.c:570: warning: Function parameter or member 'ies' not described in 'iwl_fill_probe_req'
 drivers/net/wireless/intel/iwlwifi/dvm/scan.c:570: warning: Function parameter or member 'ie_len' not described in 'iwl_fill_probe_req'
 drivers/net/wireless/intel/iwlwifi/dvm/scan.c:570: warning: Function parameter or member 'ssid' not described in 'iwl_fill_probe_req'
 drivers/net/wireless/intel/iwlwifi/dvm/scan.c:570: warning: Function parameter or member 'ssid_len' not described in 'iwl_fill_probe_req'
 drivers/net/wireless/intel/iwlwifi/dvm/scan.c:570: warning: Function parameter or member 'left' not described in 'iwl_fill_probe_req'

Cc: Johannes Berg <johannes.berg@intel.com>
Cc: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Cc: Luca Coelho <luciano.coelho@intel.com>
Cc: Intel Linux Wireless <linuxwifi@intel.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/20200910065431.657636-12-lee.jones@linaro.org

drivers/net/wireless/intel/iwlwifi/dvm/scan.c

@@ -186,7 +186,7 @@ static void iwl_do_scan_abort(struct iwl_priv *priv)
 		IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
 }
 
-/**
+/*
  * iwl_scan_cancel - Cancel any currently executing HW scan
  */
 int iwl_scan_cancel(struct iwl_priv *priv)
@@ -196,10 +196,9 @@ int iwl_scan_cancel(struct iwl_priv *priv)
 	return 0;
 }
 
-/**
+/*
  * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
  * @ms: amount of time to wait (in milliseconds) for scan to abort
- *
  */
 void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
 {
@@ -560,10 +559,9 @@ static int iwl_get_channels_for_scan(struct iwl_priv *priv,
 	return added;
 }
 
-/**
+/*
  * iwl_fill_probe_req - fill in all required fields and IE for probe request
  */
-
 static u16 iwl_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
 			      const u8 *ies, int ie_len, const u8 *ssid,
 			      u8 ssid_len, int left)