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/panel.h b/include/panel.h
index cd596d4..ab417bc 100644
--- a/include/panel.h
+++ b/include/panel.h
@@ -43,7 +43,7 @@
  *
  * @dev:	Panel device containing the backlight to enable
  * @enable:	true to enable the backlight, false to dis
- * @return 0 if OK, -ve on error
+ * Return: 0 if OK, -ve on error
  */
 int panel_enable_backlight(struct udevice *dev);
 
@@ -52,7 +52,7 @@
  *
  * @dev:	Panel device containing the backlight to update
  * @percent:	Brightness value (0 to 100, or BACKLIGHT_... value)
- * @return 0 if OK, -ve on error
+ * Return: 0 if OK, -ve on error
  */
 int panel_set_backlight(struct udevice *dev, int percent);
 
@@ -60,7 +60,7 @@
  * panel_get_display_timing() - Get display timings from panel.
  *
  * @dev:	Panel device containing the display timings
- * @return 0 if OK, -ve on error
+ * Return: 0 if OK, -ve on error
  */
 int panel_get_display_timing(struct udevice *dev,
 			     struct display_timing *timing);