Add reference to default versions in tutorial
@@ -298,7 +298,8 @@ This has several advantages:
- It can be different for every version (more on versioning in the next section).
- Some configurations are only available using the config file.
-Read the Docs works without this configuration by making some decisions on your behalf.
+Read the Docs works without this configuration
+by :doc:`making some decisions on your behalf </default-versions>`.
For example, what Python version to use, how to install the requirements, and others.
.. tip::
