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/conf.py b/conf.py
index 53961f6..d3da557 100644
--- a/conf.py
+++ b/conf.py
@@ -23,7 +23,7 @@
 author = u'VOLTHA Contributors'
 
 # The short X.Y version
-version = "2.2.0-dev"
+version = "2.2.0"
 
 # The full version, including alpha/beta/rc tags
 release = version