Cleanup

- Use doc8 to check rst files
- Add spellcheck and VOLTHA-specific dictionary, fix spelling
- Other formatting and content fixes

Change-Id: I1eea3ab6eba4ec34af0788a681f1e8cd258ea988
diff --git a/overview/physical_layout.rst b/overview/physical_layout.rst
index 978be8f..850a64a 100644
--- a/overview/physical_layout.rst
+++ b/overview/physical_layout.rst
@@ -5,5 +5,7 @@
 
 Coming Soon.
 
-For the time being you can refer to the `SEBA LAB Setup guide <https://guide.opencord.org/profiles/seba/lab-setup.html#configuring-a-lab-setup>`_,
-just remember that the ``AggSwitch`` is optional in a VOLTHA deployment.
\ No newline at end of file
+For the time being you can refer to the `SEBA LAB Setup guide
+<https://guide.opencord.org/profiles/seba/lab-setup.html#configuring-a-lab-setup>`_,
+just remember that the ``AggSwitch`` is optional in a VOLTHA deployment.
+