[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_2.3.rst b/release_notes/voltha_2.3.rst
index 2208e06..17a1b52 100644
--- a/release_notes/voltha_2.3.rst
+++ b/release_notes/voltha_2.3.rst
@@ -171,4 +171,4 @@
 - ``openolt_2_3_0_asfvolt16.deb`` (available from EdgeCore site)
 - Get access credentials for https://edgecore.quickconnect.to and then login
   and navigate to File_Station -> EdgecoreNAS, and then the folder
-  /ASXvOLT16/OpenOLT_Agent/From_ONF_Distribution/ and pick the version above
+  /ASXvOLT16/OpenOLT_Agent/From_LF_BB_Distribution/ and pick the version above