qcacmn: Fix WMI documentation

The kernel-doc script identified many documentation issues in
the wmi folder, so fix them.

Note that in quite a few cases there is duplicate documentation in .h
and .c files, and in those cases remove the documentation from the .c
files since the interface should be documented, not the
implementation.

Change-Id: I097d5b8e8f0ba09046b7b8abe338d05a00f8cc7e
CRs-Fixed: 3372831

wmi/inc/wmi_unified_reg_api.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2017-2021 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -27,7 +28,7 @@
 /**
  * wmi_extract_reg_chan_list_update_event() - function to update channel list
  * @wmi_handle: wmi handle
- * @event_buf: event buffer
+ * @evt_buf: event buffer
  * @reg_info: regulatory info
  * @len: length of buffer
  *