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/sdhci-adma.c b/drivers/mmc/sdhci-adma.c
index 2ec057f..8213223 100644
--- a/drivers/mmc/sdhci-adma.c
+++ b/drivers/mmc/sdhci-adma.c
@@ -64,7 +64,7 @@
 /**
  * sdhci_adma_init() - initialize the ADMA descriptor table
  *
- * @return pointer to the allocated descriptor table or NULL in case of an
+ * Return: pointer to the allocated descriptor table or NULL in case of an
  * error.
  */
 struct sdhci_adma_desc *sdhci_adma_init(void)