Update readme

Author: christophfroehlich

README.md

@@ -6,7 +6,7 @@ This is a ROS 2 package for using C++ kinematics frameworks in the context of RO
 ROS2 Distro | Branch | Build status | Documentation | Released packages
 :---------: | :----: | :----------: | :-----------: | :---------------:
 **Rolling** | [`master`](https://github.com/ros-controls/kinematics_interface/tree/master) | [![Rolling Binary Build](https://github.com/ros-controls/kinematics_interface/actions/workflows/rolling-binary-build-main.yml/badge.svg?branch=master)](https://github.com/ros-controls/kinematics_interface/actions/workflows/rolling-binary-build-main.yml?branch=master) <br /> [![Rolling Semi-Binary Build](https://github.com/ros-controls/kinematics_interface/actions/workflows/rolling-semi-binary-build-main.yml/badge.svg?branch=master)](https://github.com/ros-controls/kinematics_interface/actions/workflows/rolling-semi-binary-build-main.yml?branch=master) |   | [kinematics_interface](https://index.ros.org/p/kinematics_interface/#rolling)
-**Iron** | [`master`](https://github.com/ros-controls/kinematics_interface/tree/master) | [![Iron Binary Build](https://github.com/ros-controls/kinematics_interface/actions/workflows/iron-binary-build-main.yml/badge.svg?branch=master)](https://github.com/ros-controls/kinematics_interface/actions/workflows/iron-binary-build-main.yml?branch=master) <br /> [![Iron Semi-Binary Build](https://github.com/ros-controls/kinematics_interface/actions/workflows/iron-semi-binary-build-main.yml/badge.svg?branch=master)](https://github.com/ros-controls/kinematics_interface/actions/workflows/iron-semi-binary-build-main.yml?branch=master) |   | [kinematics_interface](https://index.ros.org/p/kinematics_interface/#iron)
+**Iron** | [`master`](https://github.com/ros-controls/kinematics_interface/tree/master) | see above  |   | [kinematics_interface](https://index.ros.org/p/kinematics_interface/#iron)
 **Humble** | [`humble`](https://github.com/ros-controls/kinematics_interface/tree/master) | [![Humble Binary Build](https://github.com/ros-controls/kinematics_interface/actions/workflows/humble-binary-build-main.yml/badge.svg?branch=master)](https://github.com/ros-controls/kinematics_interface/actions/workflows/humble-binary-build-main.yml?branch=master) <br /> [![Humble Semi-Binary Build](https://github.com/ros-controls/kinematics_interface/actions/workflows/humble-semi-binary-build-main.yml/badge.svg?branch=master)](https://github.com/ros-controls/kinematics_interface/actions/workflows/humble-semi-binary-build-main.yml?branch=master) |   | [kinematics_interface](https://index.ros.org/p/kinematics_interface/#humble)
 
 ### Explanation of different build types