[VOL-5545] Update voltha docs

- release notes for VOLTHA versions 2.6 to 2.15 with new Jira links and adjust release schedule details
- update old links
- remove ONF references and links
- update e-mail links
- update copright notices

Change-Id: Id6be18986a8f52f2dfcc07e2b0d2efcb0ae1c0e4
Signed-off-by: serkant.uluderya <serkant.uluderya@netsia.com>
diff --git a/makefiles-orig/lint/Makefile b/makefiles-orig/lint/Makefile
index 2754d0f..769bb2c 100644
--- a/makefiles-orig/lint/Makefile
+++ b/makefiles-orig/lint/Makefile
@@ -1,6 +1,6 @@
 # -*- makefile -*-
 # -----------------------------------------------------------------------
-# Copyright 2017-2022 Open Networking Foundation (ONF) and the ONF Contributors
+# Copyright 2017-2022 Linux Foundation Broadband Contributors
 # SPDX-FileCopyrightText: 2022-present Intel Corporation
 #
 # SPDX-License-Identifier: Apache-2.0