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/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index 1c5e2e7..125ae53 100644
--- a/drivers/gpio/gpio-uclass.c
+++ b/drivers/gpio/gpio-uclass.c
@@ -53,7 +53,7 @@
  *
  * @gpio:	The numeric representation of the GPIO
  * @desc:	Returns description (desc->flags will always be 0)
- * @return 0 if found, -ENOENT if not found
+ * Return: 0 if found, -ENOENT if not found
  */
 static int gpio_to_device(unsigned int gpio, struct gpio_desc *desc)
 {
@@ -659,7 +659,7 @@
  *
  * @desc:	GPIO description
  * @flags:	flags value to set
- * @return 0 if OK, -ve on error
+ * Return: 0 if OK, -ve on error
  */
 static int _dm_gpio_set_flags(struct gpio_desc *desc, ulong flags)
 {