[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/.gitreview b/.gitreview
index 84dc7a2..6416082 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,3 +3,4 @@
 port=29418
 project=openolt.git
 defaultremote=origin
+defaultbranch=voltha-2.3