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/arch/sandbox/include/asm/eth.h b/arch/sandbox/include/asm/eth.h
index b313bf5..f042a5f 100644
--- a/arch/sandbox/include/asm/eth.h
+++ b/arch/sandbox/include/asm/eth.h
@@ -23,7 +23,7 @@
  * @dev: device that received the packet
  * @packet: pointer to the received pacaket buffer
  * @len: length of received packet
- * @return 0 if injected, -EAGAIN if not
+ * Return: 0 if injected, -EAGAIN if not
  */
 int sandbox_eth_arp_req_to_reply(struct udevice *dev, void *packet,
 				 unsigned int len);
@@ -36,7 +36,7 @@
  * @dev: device that received the packet
  * @packet: pointer to the received pacaket buffer
  * @len: length of received packet
- * @return 0 if injected, -EAGAIN if not
+ * Return: 0 if injected, -EAGAIN if not
  */
 int sandbox_eth_ping_req_to_reply(struct udevice *dev, void *packet,
 				  unsigned int len);
@@ -47,7 +47,7 @@
  * Inject an ARP request for this target
  *
  * @dev: device that received the packet
- * @return 0 if injected, -EOVERFLOW if not
+ * Return: 0 if injected, -EOVERFLOW if not
  */
 int sandbox_eth_recv_arp_req(struct udevice *dev);
 
@@ -57,7 +57,7 @@
  * Inject a ping request for this target
  *
  * @dev: device that received the packet
- * @return 0 if injected, -EOVERFLOW if not
+ * Return: 0 if injected, -EOVERFLOW if not
  */
 int sandbox_eth_recv_ping_req(struct udevice *dev);