staging: axis-fifo: axis-fifo: Fix some formatting issues

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

 drivers/staging/axis-fifo/axis-fifo.c:356: warning: Function parameter or member 'f' not described in 'axis_fifo_read'
 drivers/staging/axis-fifo/axis-fifo.c:356: warning: Function parameter or member 'buf' not described in 'axis_fifo_read'
 drivers/staging/axis-fifo/axis-fifo.c:356: warning: Function parameter or member 'len' not described in 'axis_fifo_read'
 drivers/staging/axis-fifo/axis-fifo.c:356: warning: Function parameter or member 'off' not described in 'axis_fifo_read'
 drivers/staging/axis-fifo/axis-fifo.c:356: warning: expecting prototype for axis_fifo_write(). Prototype was for axis_fifo_read() instead
 drivers/staging/axis-fifo/axis-fifo.c:478: warning: Function parameter or member 'f' not described in 'axis_fifo_write'
 drivers/staging/axis-fifo/axis-fifo.c:478: warning: Function parameter or member 'buf' not described in 'axis_fifo_write'
 drivers/staging/axis-fifo/axis-fifo.c:478: warning: Function parameter or member 'len' not described in 'axis_fifo_write'
 drivers/staging/axis-fifo/axis-fifo.c:478: warning: Function parameter or member 'off' not described in 'axis_fifo_write'

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "John B. Wyatt IV" <jbwyatt4@gmail.com>
Cc: Jacob Feder <jacobsfeder@gmail.com>
Cc: linux-staging@lists.linux.dev
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210414181129.1628598-37-lee.jones@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/axis-fifo/axis-fifo.c

@@ -338,10 +338,10 @@ static void reset_ip_core(struct axis_fifo *fifo)
 
 /**
  * axis_fifo_write() - Read a packet from AXIS-FIFO character device.
- * @f Open file.
- * @buf User space buffer to read to.
- * @len User space buffer length.
- * @off Buffer offset.
+ * @f: Open file.
+ * @buf: User space buffer to read to.
+ * @len: User space buffer length.
+ * @off: Buffer offset.
  *
  * As defined by the device's documentation, we need to check the device's
  * occupancy before reading the length register and then the data. All these
@@ -460,10 +460,10 @@ static ssize_t axis_fifo_read(struct file *f, char __user *buf,
 
 /**
  * axis_fifo_write() - Write buffer to AXIS-FIFO character device.
- * @f Open file.
- * @buf User space buffer to write to the device.
- * @len User space buffer length.
- * @off Buffer offset.
+ * @f: Open file.
+ * @buf: User space buffer to write to the device.
+ * @len: User space buffer length.
+ * @off: Buffer offset.
  *
  * As defined by the device's documentation, we need to write to the device's
  * data buffer then to the device's packet length register atomically. Also,