[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/architecture_overview.rst b/overview/architecture_overview.rst
index 49e2729..83ba6ab 100644
--- a/overview/architecture_overview.rst
+++ b/overview/architecture_overview.rst
@@ -16,7 +16,7 @@
 The location of the ``kubernetes`` cluster is not of a concern of the VOLTHA project per se, it can be deployed in a
 data center, on the cloud or on the OLT box itself if the hardware is powerful enough, e.g. multi-chassis OLTs.
 Proper considerations should be made by the operator around failure and resiliency of the system in any of these
-different deployments. ONF recommends to deploy the ``kubernetes`` cluster on a 3 node bare metal cluster located
+different deployments. LF BB recommends to deploy the ``kubernetes`` cluster on a 3 node bare metal cluster located
 close to the OLT(s) location, e.g. operator's Central Office.
 
 Alongside VOLTHA and ONOS, the Device Manager, a (optional) component which implements the