Release notes added for 3.4.6

- added the release notes and openapi documentation

Issue-ID: CPS-2135
Change-Id: Ib224353ca5a529b6788ecb67c6432b806acdf557
Signed-off-by: mpriyank <priyank.maheshwari@est.tech>
diff --git a/docs/release-notes.rst b/docs/release-notes.rst
index a134d0d..f85c88e 100644
--- a/docs/release-notes.rst
+++ b/docs/release-notes.rst
@@ -39,10 +39,20 @@
 Bug Fixes
 ---------
 3.4.6
+    - `CPS-2126 <https://jira.onap.org/browse/CPS-2126>`_ Passing HTTP Authorization Bearer Token to DMI Plugins.
 
 
 Features
 --------
+    - `CPS-2133 <https://jira.onap.org/browse/CPS-2133>`_ Revert Uplift of Spring Boot version from 3.2.2 to 3.1.2
+
+Notes
+-----
+This release brings improvements to compatibility with Service Mesh and for that below measures are been taken.
+
+Basic authorization provided using Spring security is been removed from CPS-Core and NCMP and hence authorization is no longer enforced.(basic auth header will be ignored, but is still allowed).
+NCMP will propagate a bearer token to DMI conditionally.
+401 Unauthorized will not be returned. Best effort has been made to ensure backwards compatibility.
 
 Version: 3.4.5
 ==============