Adding VOLTHA 2.2 release notes to the documentation

Renamed files to use underscore delimiters, was mixed before

Fixed a few spelling/formatting issues

Change-Id: I4d66ff64c2e7488b1a77be9535cf3398d8a2e2ed
diff --git a/index.rst b/index.rst
index dc0c21e..056bb95 100644
--- a/index.rst
+++ b/index.rst
@@ -8,14 +8,22 @@
 .. toctree::
    :maxdepth: 1
    :caption: Overview
+   :glob:
 
-   overview/deploy-physical.rst
-   overview/physical_layout.rst
-   overview/deploy-virtual.rst
-   overview/development_loop.rst
-   overview/troubleshooting.rst
-   overview/known_issues.rst
-   overview/contribute.rst
+   overview/*
+
+.. toctree::
+   :maxdepth: 2
+   :caption: BBSim
+
+   bbsim/docs/source/index.rst
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Release Notes
+   :glob:
+
+   release_notes/*
 
 .. toctree::
    :maxdepth: 1
@@ -38,12 +46,6 @@
    voltha-protos/README.md
 
 .. toctree::
-   :maxdepth: 2
-   :caption: BBSim
-
-   bbsim/docs/source/index.rst
-
-.. toctree::
    :maxdepth: 1
    :caption: Documentation Notes