Add functional and non-functional requirements lists

As decided in PTL meeting (30 november 2020), add list of
functional and non-functional requirements

Add :orphan: to avoid remaining warnings during Documentation build

Issue-ID: DOC-687

Signed-off-by: Eric Debeau <eric.debeau@orange.com>
Change-Id: I305057e0de909e0165d0ca8a05b426e97ed1b111
diff --git a/docs/release-notes.rst b/docs/release-notes.rst
index 67141c5..1f0f6b5 100644
--- a/docs/release-notes.rst
+++ b/docs/release-notes.rst
@@ -5,6 +5,8 @@
 
 .. _doc_release_notes:
 
+:orphan:
+
 Release Notes
 =============