staging: wfx: update files descriptions

Each file of the driver contains a short description of its purpose.
These description were a bit outdated.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20210913130203.1903622-26-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/bh.h

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Interrupt bottom half.
+ * Interrupt bottom half (BH).
  *
  * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
  * Copyright (c) 2010, ST-Ericsson

drivers/staging/wfx/data_rx.c

 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Datapath implementation.
+ * Data receiving implementation.
  *
  * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
  * Copyright (c) 2010, ST-Ericsson

drivers/staging/wfx/data_rx.h

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Datapath implementation.
+ * Data receiving implementation.
  *
  * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
  * Copyright (c) 2010, ST-Ericsson

drivers/staging/wfx/data_tx.c

 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Datapath implementation.
+ * Data transmitting implementation.
  *
  * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
  * Copyright (c) 2010, ST-Ericsson

drivers/staging/wfx/data_tx.h

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Datapath implementation.
+ * Data transmitting implementation.
  *
  * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
  * Copyright (c) 2010, ST-Ericsson

drivers/staging/wfx/hwio.h

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Low-level API.
+ * Low-level I/O functions.
  *
  * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
  * Copyright (c) 2010, ST-Ericsson

drivers/staging/wfx/key.h

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Implementation of mac80211 API.
+ * Key management related functions.
  *
  * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
  * Copyright (c) 2010, ST-Ericsson

drivers/staging/wfx/queue.c

 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * O(1) TX queue with built-in allocator.
+ * Queue between the tx operation and the bh workqueue.
  *
  * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
  * Copyright (c) 2010, ST-Ericsson

drivers/staging/wfx/queue.h

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * O(1) TX queue with built-in allocator.
+ * Queue between the tx operation and the bh workqueue.
  *
  * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
  * Copyright (c) 2010, ST-Ericsson