Extend class/method docs and publish as user guide

Minor changes to simplify the SDL wrapper methods, none functional.

Bump version to 1.1.2.

Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>
Change-Id: Ie1d8ace03315bfd9a75aadc933aa66cf3be3e7ff
diff --git a/docs/developer-guide.rst b/docs/developer-guide.rst
index 06f01b7..6cfe369 100644
--- a/docs/developer-guide.rst
+++ b/docs/developer-guide.rst
@@ -1,9 +1,13 @@
 .. This work is licensed under a Creative Commons Attribution 4.0 International License.
-.. http://creativecommons.org/licenses/by/4.0
+.. SPDX-License-Identifier: CC-BY-4.0
+.. Copyright (C) 2020 AT&T Intellectual Property
 
 Developer Guide
 ===============
 
+This document explains how to maintain the RIC Xapp framework.
+Information for users of this framework (i.e., Xapp developers) is in the User Guide.
+
 Tech Stack
 ----------