Correct an error in the function description.

Signed-off-by: Barry Xu <barry.xu@sony.com>

Author: Barry-Xu-2018

rclcpp_action/include/rclcpp_action/client_base.hpp

@@ -306,9 +306,9 @@ class ClientBase : public rclcpp::Waitable
 
   /// \internal
   /// \return true if goal id was removed from feedback subscription content filter successfully or
-  ///   goal id was not found in feedback subscription content filter or
+  ///   goal id was not found in feedback subscription content filter
+  /// \return false if an error occurred during calling rcl function or
   ///   if the used rmw middleware doesn't support Content Filtering feature.
-  /// \return false if an error occurred during calling rcl function.
   bool
   configure_feedback_subscription_filter_remove_goal_id(const GoalUUID & goal_id);