Docs: Release notes for v2.2.0

- Add notes for TF-Mv2.2.0.
- Remove refs to v1.8.x from TOC to simplify the view, though the
  documents are not removed.

Signed-off-by: Nicola Mazzucato <nicola.mazzucato@arm.com>
Change-Id: Ic58768114305f89425c7e58a440b5b29787842e0
diff --git a/docs/conf.py b/docs/conf.py
index 9a35392..0ff0cb4 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #-------------------------------------------------------------------------------
-# Copyright (c) 2019-2024, Arm Limited. All rights reserved.
+# SPDX-FileCopyrightText: Copyright The TrustedFirmware-M Contributors
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -20,7 +20,7 @@
 # -- Project information -----------------------------------------------------
 
 project = 'Trusted Firmware-M'
-copyright = '2017-2024, ARM CE-OSS'
+copyright = '2017-2025, ARM CE-OSS'
 author = 'ARM CE-OSS'
 title = 'User Guide'