[VOL-2875] Documentation update

General language (spelling, flow) fixes
Remove redundant documentation
Change protos Makefile to generate directory using dependencies

(Cherry pick of https://gerrit.opencord.org/c/18482/ )

Change-Id: I24fb2c9259c1a29b7499a35fd13e50836333c58e
diff --git a/VERSION b/VERSION
index 276cbf9..32d1656 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.3.0
+2.3.1-dev