[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/patch_followup.rst b/overview/contributing/patch_followup.rst
index 20c0abb..a176a86 100644
--- a/overview/contributing/patch_followup.rst
+++ b/overview/contributing/patch_followup.rst
@@ -79,7 +79,7 @@
    % git log --author="joey" | less
 
    commit 23ce887c4cb3f98506536e00c58ffc8c2af16afe
-   Author: Joey Armstrong <joey@opennetworking.org>
+   Author: Joey Armstrong <joey@lfbroadband.org>
    Date:   Thu Aug 24 09:46:22 2023 -0400
 
       [VOL-5009] - Update release notes