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/video/panel-uclass.c b/drivers/video/panel-uclass.c
index bb2eaae..1f7e20e 100644
--- a/drivers/video/panel-uclass.c
+++ b/drivers/video/panel-uclass.c
@@ -26,7 +26,7 @@
  * @dev:	Panel device containing the backlight to update
  * @percent:	Brightness value (0=off, 1=min brightness,
  *		100=full brightness)
- * @return 0 if OK, -ve on error
+ * Return: 0 if OK, -ve on error
  */
 int panel_set_backlight(struct udevice *dev, int percent)
 {