[VOL-2875] Documentation update

Also, update the Makefile "help" target to self-generate from comments

(Cherry pick of https://gerrit.opencord.org/c/18465/, no code changes)

Change-Id: I26d329a2838ea360f3b2c96d44357b9fb8c51b84
diff --git a/VERSION b/VERSION
index a4c8060..97e787b 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.3.22
+2.3.23-dev