flow_offload: fix flow_offload_has_one_action() kdoc

include/net/flow_offload.h:351: warning:
  No description found for return value of 'flow_offload_has_one_action'
Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Link: https://lore.kernel.org/r/20240410114718.15145-1-ast@fiberby.netSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/flow_offload.h

@@ -345,7 +345,7 @@ static inline bool flow_action_has_entries(const struct flow_action *action)
  * flow_offload_has_one_action() - check if exactly one action is present
  * @action: tc filter flow offload action
  *
- * Returns true if exactly one action is present.
+ * Return: true if exactly one action is present.
  */
 static inline bool flow_offload_has_one_action(const struct flow_action *action)
 {