doc: replace @return by Return:

Sphinx expects Return: and not @return to indicate a return value.

find . -name '*.c' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

find . -name '*.h' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/include/usb_ether.h b/include/usb_ether.h
index e85acad..8c7bd06 100644
--- a/include/usb_ether.h
+++ b/include/usb_ether.h
@@ -43,7 +43,7 @@
  * @dev:	USB device
  * @ss:		Place to put USB ethernet data
  * @rxsize:	Maximum size to allocate for the receive buffer
- * @return 0 if OK, -ve on error
+ * Return: 0 if OK, -ve on error
  */
 int usb_ether_register(struct udevice *dev, struct ueth_data *ueth, int rxsize);
 
@@ -51,7 +51,7 @@
  * usb_ether_deregister() - deregister a USB ethernet device
  *
  * @ueth:	USB Ethernet device
- * @return 0
+ * Return: 0
  */
 int usb_ether_deregister(struct ueth_data *ueth);
 
@@ -62,7 +62,7 @@
  *
  * @ueth:	USB Ethernet device
  * @rxsize:	Maximum size to receive
- * @return 0 if a packet was received, -EAGAIN if not, -ENOSPC if @rxsize is
+ * Return: 0 if a packet was received, -EAGAIN if not, -ENOSPC if @rxsize is
  * larger than the size passed ot usb_ether_register(), other -ve on error
  */
 int usb_ether_receive(struct ueth_data *ueth, int rxsize);
@@ -77,7 +77,7 @@
  * @ueth:	USB Ethernet device
  * @ptrp:	Returns a pointer to the start of the next packet if there is
  *		one available
- * @return number of bytes available, or 0 if none
+ * Return: number of bytes available, or 0 if none
  */
 int usb_ether_get_rx_bytes(struct ueth_data *ueth, uint8_t **ptrp);