[VOL-5009] - Update release notes

[VOL-5061]

overview/releases.rst
---------------------
  o Correct start/end release dates for v2.10-v2.12 to reflect reality.

release_notes/voltha_2.12.rst
-----------------------------
  o Populate the onos apps grid with versioned artifact and VCS urls.
  o Component kafka the only holdout

howto/release/checklist.rst
howto/release/components/index.rst
howto/release/index.rst
howto/release/voltha-docs/index.rst
howto/release/voltha-docs/release_notes.rst
howto/release/branching/
howto/release/components/igmpproxy/
howto/release/components/kafka/
howto/release/components/maclearner/
howto/release/components/pppoeagent/
howto/release/voltha-docs/release_history.rst
---------------------------------------------
  o Add more random content and links for release dependencies and tasks.

Change-Id: I31338488a4e626a97435429a36e200d54cf6267e
diff --git a/howto/release/branching/index.rst b/howto/release/branching/index.rst
new file mode 100644
index 0000000..ae389f0
--- /dev/null
+++ b/howto/release/branching/index.rst
@@ -0,0 +1,6 @@
+Release Branching Tasks
+=======================
+- `VOL-5063 <https://jira.opencord.org/browse/VOL-5063>`_
+
+  - Freeze version of voltctl captured by the build docker image target.
+