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/arch/sandbox/cpu/os.c b/arch/sandbox/cpu/os.c
index 40ebe32..d83c862 100644
--- a/arch/sandbox/cpu/os.c
+++ b/arch/sandbox/cpu/os.c
@@ -718,7 +718,7 @@
  * @argvp:  Returns newly allocated args list
  * @add_args: Arguments to add, each a string
  * @count: Number of arguments in @add_args
- * @return 0 if OK, -ENOMEM if out of memory
+ * Return: 0 if OK, -ENOMEM if out of memory
  */
 static int add_args(char ***argvp, char *add_args[], int count)
 {
@@ -764,7 +764,7 @@
  * execs it.
  *
  * @fname: Filename to exec
- * @return does not return on success, any return value is an error
+ * Return: does not return on success, any return value is an error
  */
 static int os_jump_to_file(const char *fname, bool delete_it)
 {