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/wdt.h b/include/wdt.h
index baaa9db..5026f5a 100644
--- a/include/wdt.h
+++ b/include/wdt.h
@@ -60,7 +60,7 @@
  *
  * @dev: WDT Device
  * @flags: Driver specific flags
- * @return 0 if OK -ve on error. If wdt action is system reset,
+ * Return: 0 if OK -ve on error. If wdt action is system reset,
  * this function may never return.
  */
 int wdt_expire_now(struct udevice *dev, ulong flags);