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/drivers/i2c/i2c-uclass.c b/drivers/i2c/i2c-uclass.c
index 71bc2b5..5539bec 100644
--- a/drivers/i2c/i2c-uclass.c
+++ b/drivers/i2c/i2c-uclass.c
@@ -53,7 +53,7 @@
  * @offset:	Byte offset within chip
  * @offset_buf:	Place to put byte offset
  * @msg:	Message buffer
- * @return 0 if OK, -EADDRNOTAVAIL if the offset length is 0. In that case the
+ * Return: 0 if OK, -EADDRNOTAVAIL if the offset length is 0. In that case the
  * message is still set up but will not contain an offset.
  */
 static int i2c_setup_offset(struct dm_i2c_chip *chip, uint offset,
@@ -268,7 +268,7 @@
  * @bus:	Bus to probe
  * @chip_addr:	Chip address to probe
  * @flags:	Flags for the chip
- * @return 0 if found, -ENOSYS if the driver is invalid, -EREMOTEIO if the chip
+ * Return: 0 if found, -ENOSYS if the driver is invalid, -EREMOTEIO if the chip
  * does not respond to probe
  */
 static int i2c_probe_chip(struct udevice *bus, uint chip_addr,