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/reboot-mode/reboot-mode.h b/include/reboot-mode/reboot-mode.h
index 86b51f8..5fbd7c8 100644
--- a/include/reboot-mode/reboot-mode.h
+++ b/include/reboot-mode/reboot-mode.h
@@ -49,7 +49,7 @@
  * dm_reboot_mode_update() - Update the reboot mode env variable.
  *
  * @dev:	Device to read from
- * @return 0 if OK, -ve on error
+ * Return: 0 if OK, -ve on error
  */
 int dm_reboot_mode_update(struct udevice *dev);