VOL-4890 - Create a v2.11 release notes page.

Create a stub v2.11 release notes page to accumulate content.
Correct spelling in a few files.
Bump version string.

Change-Id: Ie303d239ccfdb6c8085656fafea59189ed32f508
diff --git a/conf.py b/conf.py
index fbde864..fc4b455 100644
--- a/conf.py
+++ b/conf.py
@@ -302,6 +302,7 @@
         r'../release_notes/voltha_2.8.html',
         r'../release_notes/voltha_2.9.html',
         r'../release_notes/voltha_2.10.html',
+        r'../release_notes/voltha_2.11.html',
     ]
 
 # -- Configure recommonmark to use AutoStructify -----------------------------