[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/release_notes/voltha_2.13.rst b/release_notes/voltha_2.13.rst
index 4150a95..cb7119f 100644
--- a/release_notes/voltha_2.13.rst
+++ b/release_notes/voltha_2.13.rst
@@ -529,7 +529,7 @@
 Mailing List
 ++++++++++++
 
-  - `voltha-discuss@opennetworking.org <https://groups.google.com/a/opennetworking.org/g/voltha-discuss>`_.
+  - `discuss@lists.voltha.org <https://lists.voltha.org/g/discuss>`_.
 
 Weekly TST Meetings
 +++++++++++++++++++
@@ -540,7 +540,7 @@
 Website(s)
 ++++++++++
 
-  - `onf/VOLTHA <https://opennetworking.org/voltha/>`_
+  - `LF BB/VOLTHA <https://lfbroadband.org/projects/voltha/>`_
   - `docs.voltha.org <https://docs.voltha.org>`_
   - `Wiki <https://lf-broadband.atlassian.net/wiki>`_