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/block/blk_legacy.c b/drivers/block/blk_legacy.c
index e3ee778..df9a359 100644
--- a/drivers/block/blk_legacy.c
+++ b/drivers/block/blk_legacy.c
@@ -52,7 +52,7 @@
  * @drv:	Legacy block driver
  * @devnum:	Device number (0 = first)
  * @descp:	Returns block device descriptor on success
- * @return 0 on success, -ENODEV if there is no such device, -ENOSYS if the
+ * Return: 0 on success, -ENODEV if there is no such device, -ENOSYS if the
  * driver does not provide a way to find a device, or other -ve on other
  * error.
  */