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/command.c b/common/command.c
index 95af73f..41c91c6 100644
--- a/common/command.c
+++ b/common/command.c
@@ -570,7 +570,7 @@
  * @param argc		Number of arguments (arg 0 must be the command text)
  * @param argv		Arguments
  * @param repeatable	Can the command be repeated
- * @return 0 if command succeeded, else non-zero (CMD_RET_...)
+ * Return: 0 if command succeeded, else non-zero (CMD_RET_...)
  */
 static int cmd_call(struct cmd_tbl *cmdtp, int flag, int argc,
 		    char *const argv[], int *repeatable)