Mention path URL parameter

Author: joelostblom

docs/full.rst

@@ -3,7 +3,7 @@ Fullscreen access
 
 You can access the JupyterLite deployment that ``jupyterlite-sphinx`` made for you, in fullscreen, following the ``./lite/lab`` and ``./lite/retro`` relative urls:
 
+- `JupyterLab <./lite/lab/index.html>`_
+- `Retrolab <./lite/retro/index.html>`_
 
-`JupyterLab <./lite/lab/index.html>`_
-
-`Retrolab <./lite/retro/index.html>`_
+If you want to open a specific notebook in fullscreen  JupyterLab/Retrolab you can use the ``path`` URL parameter, e.g. ``./lite/lab/?path=my_noteboook.ipynb``.