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)
 {
diff --git a/drivers/gpio/iproc_gpio.c b/drivers/gpio/iproc_gpio.c
index 8c143e9..7187d32 100644
--- a/drivers/gpio/iproc_gpio.c
+++ b/drivers/gpio/iproc_gpio.c
@@ -123,7 +123,7 @@
  * in private data structure to use it later while enabling gpio.
  *
  * @dev: pointer to GPIO device
- * @return 0 on success and -ENOMEM on failure
+ * Return: 0 on success and -ENOMEM on failure
  */
 static int iproc_get_gpio_pctrl_mapping(struct udevice *dev)
 {
diff --git a/drivers/gpio/sunxi_gpio.c b/drivers/gpio/sunxi_gpio.c
index cdbc40d..caefb14 100644
--- a/drivers/gpio/sunxi_gpio.c
+++ b/drivers/gpio/sunxi_gpio.c
@@ -225,7 +225,7 @@
  * GPIO banks are named A, B, C, ...
  *
  * @bank:	Bank number (0, 1..n-1)
- * @return allocated string containing the name
+ * Return: allocated string containing the name
  */
 static char *gpio_bank_name(int bank)
 {
diff --git a/drivers/gpio/tegra_gpio.c b/drivers/gpio/tegra_gpio.c
index e00f104..4291e49 100644
--- a/drivers/gpio/tegra_gpio.c
+++ b/drivers/gpio/tegra_gpio.c
@@ -264,7 +264,7 @@
  * GPIOs are named A, B, C, ..., Z, AA, BB, CC, ...
  *
  * @base_port: Base port number (0, 1..n-1)
- * @return allocated string containing the name
+ * Return: allocated string containing the name
  */
 static char *gpio_port_name(int base_port)
 {