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/mmc/mmc.c b/drivers/mmc/mmc.c
index 4d9871d..f6ccd83 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -215,7 +215,7 @@
  * @data:	additional data to send/receive
  * @retries:	how many times to retry; mmc_send_cmd is always called at least
  *              once
- * @return 0 if ok, -ve on error
+ * Return: 0 if ok, -ve on error
  */
 static int mmc_send_cmd_retry(struct mmc *mmc, struct mmc_cmd *cmd,
 			      struct mmc_data *data, uint retries)
@@ -239,7 +239,7 @@
  * @quirk:	retry only if this quirk is enabled
  * @retries:	how many times to retry; mmc_send_cmd is always called at least
  *              once
- * @return 0 if ok, -ve on error
+ * Return: 0 if ok, -ve on error
  */
 static int mmc_send_cmd_quirks(struct mmc *mmc, struct mmc_cmd *cmd,
 			       struct mmc_data *data, u32 quirk, uint retries)