Fix code reference lines in the action (cpp) documentation

[MortezaHagh]

Reference code lines for the part " The constructor also instantiates a new action server" are corrected. They were refering to lines:

loop_rate.sleep();
}
// Check if goal is done
if (rclcpp::ok()) {

However, they should refer to lines:

his->action_server_ = rclcpp_action::create_server<Fibonacci>(
      this,
      "fibonacci",
      handle_goal,
      handle_cancel,
      handle_accepted);

[ahcorde]

https://github.com/Mergifyio backport jazzy

[mergify]

backport jazzy

✅ Backports have been created

• #5055 Fix code reference lines in the action (cpp) documentation (backport #5054) has been created for branch jazzy