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/board/ti/sdp4430/sdp.c b/board/ti/sdp4430/sdp.c
index 69726eb..2c9ae79 100644
--- a/board/ti/sdp4430/sdp.c
+++ b/board/ti/sdp4430/sdp.c
@@ -25,7 +25,7 @@
 /**
  * @brief board_init
  *
- * @return 0
+ * Return: 0
  */
 int board_init(void)
 {
@@ -46,7 +46,7 @@
  * such as power configurations, ethernet initialization as phase2 of
  * boot sequence
  *
- * @return 0
+ * Return: 0
  */
 int misc_init_r(void)
 {