brcmfmac: fweh: Fix docrot related function documentation issues

Also demote a commit block header which is clearly not suitable for kerneldoc.

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

 drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c: In function ‘brcmf_fweh_handle_if_event’:
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c:131:6: warning: variable ‘err’ set but not used [-Wunused-but-set-variable]
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c:36: warning: Function parameter or member 'datalen' not described in 'brcmf_fweh_queue_item'
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c:44: warning: Function parameter or member 'code' not described in 'brcmf_fweh_event_name'
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c:44: warning: Function parameter or member 'name' not described in 'brcmf_fweh_event_name'
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c:127: warning: Function parameter or member 'emsg' not described in 'brcmf_fweh_handle_if_event'
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c:127: warning: Function parameter or member 'data' not described in 'brcmf_fweh_handle_if_event'
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c:127: warning: Excess function parameter 'item' description in 'brcmf_fweh_handle_if_event'
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c:127: warning: Excess function parameter 'ifpp' description in 'brcmf_fweh_handle_if_event'
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c:391: warning: Function parameter or member 'packet_len' not described in 'brcmf_fweh_process_event'

Cc: Arend van Spriel <arend.vanspriel@broadcom.com>
Cc: Franky Lin <franky.lin@broadcom.com>
Cc: Hante Meuleman <hante.meuleman@broadcom.com>
Cc: Chi-Hsien Lin <chi-hsien.lin@cypress.com>
Cc: Wright Feng <wright.feng@cypress.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: linux-wireless@vger.kernel.org
Cc: brcm80211-dev-list.pdl@broadcom.com
Cc: brcm80211-dev-list@cypress.com
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/20200814113933.1903438-24-lee.jones@linaro.org

drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c

@@ -23,6 +23,7 @@
  * @ifidx: interface index related to this event.
  * @ifaddr: ethernet address for interface.
  * @emsg: common parameters of the firmware event message.
+ * @datalen: length of the data array
  * @data: event specific data part of the firmware event.
  */
 struct brcmf_fweh_queue_item {
@@ -35,7 +36,7 @@ struct brcmf_fweh_queue_item {
 	u8 data[];
 };
 
-/**
+/*
  * struct brcmf_fweh_event_name - code, name mapping entry.
  */
 struct brcmf_fweh_event_name {
@@ -118,8 +119,8 @@ static int brcmf_fweh_call_event_handler(struct brcmf_pub *drvr,
  * brcmf_fweh_handle_if_event() - handle IF event.
  *
  * @drvr: driver information object.
- * @item: queue entry.
- * @ifpp: interface object (may change upon ADD action).
+ * @emsg: event message object.
+ * @data: event object.
  */
 static void brcmf_fweh_handle_if_event(struct brcmf_pub *drvr,
 				       struct brcmf_event_msg *emsg,
@@ -380,6 +381,7 @@ int brcmf_fweh_activate_events(struct brcmf_if *ifp)
  *
  * @drvr: driver information object.
  * @event_packet: event packet to process.
+ * @packet_len: length of the packet
  *
  * If the packet buffer contains a firmware event message it will
  * dispatch the event to a registered handler (using worker).