fix dead link for launch architecture.

source/Tutorials/Intermediate/Launch/Launch-system.rst

@@ -228,7 +228,7 @@ After the ``colcon build`` has been successful and you've sourced the workspace,
 Documentation
 -------------
 
-`The launch documentation <https://docs.ros.org/en/{DISTRO}/p/launch/architecture.html>`__ provides more details on concepts that are also used in ``launch_ros``.
+`The launch documentation <https://docs.ros.org/en/{DISTRO}/p/launch/doc/source/architecture.html>`__ provides more details on concepts that are also used in ``launch_ros``.
 
 Additional documentation/examples of launch capabilities are forthcoming.
 See the source code (https://github.com/ros2/launch and https://github.com/ros2/launch_ros) in the meantime.

source/Tutorials/Intermediate/Launch/Using-Event-Handlers.rst

@@ -125,7 +125,7 @@ Additionally, it will log messages to the console when:
 Documentation
 -------------
 
-`The launch documentation <https://docs.ros.org/en/{DISTRO}/p/launch/architecture.html>`_ provides detailed information about available event handlers.
+`The launch documentation <https://docs.ros.org/en/{DISTRO}/p/launch/doc/source/architecture.html>`_ provides detailed information about available event handlers.
 
 Summary
 -------

source/Tutorials/Intermediate/Launch/Using-Substitutions.rst

@@ -458,7 +458,7 @@ Now you can pass the desired arguments to the launch file as follows:
 Documentation
 -------------
 
-`The launch documentation <https://docs.ros.org/en/{DISTRO}/p/launch/architecture.html>`_ provides detailed information about available substitutions.
+`The launch documentation <https://docs.ros.org/en/{DISTRO}/p/launch/doc/source/architecture.html>`_ provides detailed information about available substitutions.
 
 Summary
 -------