[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/overview/contributing/copyright/copyright.rst b/overview/contributing/copyright/copyright.rst
index 19737f6..233ff4f 100644
--- a/overview/contributing/copyright/copyright.rst
+++ b/overview/contributing/copyright/copyright.rst
@@ -1,9 +1,9 @@
 Copyright Notice
 ================
 
-Include a copyright notice with all submissions to ONF repositoreis.
+Include a copyright notice with all submissions to LF BB repositoreis.
 
-- ``Copyright 2017-2023 Open Networking Foundation Contributors``
+- ``Copyright 2017-2023 LF BB Contributors``
 - NOTE: Range values such as -present are not legally binding
 
   - Copyright notice should be dated to the last year sources were modified.