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/common/stdio.c b/common/stdio.c
index 0f2eb6f..976f51c 100644
--- a/common/stdio.c
+++ b/common/stdio.c
@@ -144,7 +144,7 @@
  * @name:	stdio device name (e.g. "vidconsole")
  * id:		Uclass ID of device to look for (e.g. UCLASS_VIDEO)
  * @sdevp:	Returns stdout device, if found, else NULL
- * @return 0 if found, -ENOENT if no device found with that name, other -ve
+ * Return: 0 if found, -ENOENT if no device found with that name, other -ve
  *	   on other error
  */
 static int stdio_probe_device(const char *name, enum uclass_id id,