How do I submit a ROS 2 tutorial?

edit

You're correct that we're restructuring the tutorials layout for ROS 2.

If the tutorial that you're working on is a generic/core ROS 2 concept please contribute to https://github.com/ros2/ros2_document...

However if it's a package specific tutorial we are planning to keep those closer to the specific projects using sphinx and recommend contributing the tutorials to the packages themselves in a folder doc/tutorials using RST markdown. These will then be rendered next to the API documentation for each packages in a process we're working on setting up.