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/ns16550.h b/include/ns16550.h
index bef2071..3d9002d 100644
--- a/include/ns16550.h
+++ b/include/ns16550.h
@@ -237,7 +237,7 @@
  * @port:	UART port
  * @clock:	UART input clock speed in Hz
  * @baudrate:	Required baud rate
- * @return baud rate divisor that should be used
+ * Return: baud rate divisor that should be used
  */
 int ns16550_calc_divisor(struct ns16550 *port, int clock, int baudrate);
 
@@ -257,7 +257,7 @@
  * ns16550_serial_probe() - probe a serial port
  *
  * This sets up the serial port ready for use, except for the baud rate
- * @return 0, or -ve on error
+ * Return: 0, or -ve on error
  */
 int ns16550_serial_probe(struct udevice *dev);