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_spi.c b/drivers/mmc/mmc_spi.c
index e2d7879..bcea800 100644
--- a/drivers/mmc/mmc_spi.c
+++ b/drivers/mmc/mmc_spi.c
@@ -83,7 +83,7 @@
  * @resp_match:	if true, compare each of received bytes with @resp_match_value
  * @resp_match_value:	a value to be compared with each of received bytes
  * @r1b:	if true, receive additional bytes for busy signal token
- * @return 0 if OK, -ETIMEDOUT if no card response is received, -ve on error
+ * Return: 0 if OK, -ETIMEDOUT if no card response is received, -ve on error
  */
 static int mmc_spi_sendcmd(struct udevice *dev,
 			   ushort cmdidx, u32 cmdarg, u32 resp_type,
@@ -181,7 +181,7 @@
  * @xbuf:	buffer of the actual data (excluding token and crc) to read
  * @bcnt:	number of data blocks to transfer
  * @bsize:	size of the actual data (excluding token and crc) in bytes
- * @return 0 if OK, -ECOMM if crc error, -ETIMEDOUT on other errors
+ * Return: 0 if OK, -ECOMM if crc error, -ETIMEDOUT on other errors
  */
 static int mmc_spi_readdata(struct udevice *dev,
 			    void *xbuf, u32 bcnt, u32 bsize)
@@ -239,7 +239,7 @@
  * @bcnt:	number of data blocks to transfer
  * @bsize:	size of actual data (excluding token and crc) in bytes
  * @multi:	indicate a transfer by multiple block write command (CMD25)
- * @return 0 if OK, -ECOMM if crc error, -ETIMEDOUT on other errors
+ * Return: 0 if OK, -ECOMM if crc error, -ETIMEDOUT on other errors
  */
 static int mmc_spi_writedata(struct udevice *dev, const void *xbuf,
 			     u32 bcnt, u32 bsize, int multi)