modifying the heading in release notes

IssueId: SO-300

Change-Id: I201c0eb59af8e2279743b0627d9e1d77e3f7737b
Signed-off-by: seshukm <seshu.kumar.m@huawei.com>
diff --git a/docs/release-notes.rst b/docs/release-notes.rst
index 66b519b..c0a2984 100644
--- a/docs/release-notes.rst
+++ b/docs/release-notes.rst
@@ -3,8 +3,8 @@
 .. Copyright 2017 Huawei Intellectual Property.  All rights reserved.
 
 
-Service Orchestrator Release Notes
-==================================
+SO Release Notes
+================