Add example to 'root URL' glossary term
@@ -23,4 +23,5 @@ Glossary
root URL
Home URL of your documentation without the ``/<lang>`` and ``/<version>`` segments.
- For projects without custom domains, the one ending in ``.readthedocs.io/``.
+ For projects without custom domains, the one ending in ``.readthedocs.io/``
+ (for example, ``https://docs.readthedocs.io`` as opposed to ``https://docs.readthedocs.io/en/latest``).
