.gitignore was ignoring a documentation directory so added am explicit pattern retain it

Change-Id: I5db8220a95bc0a0b2b360db5588d70ef763e4599
diff --git a/howto/release/voltctl/release.rst b/howto/release/voltctl/release.rst
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+VOLTHA Release: voltctl
+=======================
+
+Release Builds howto:
+---------------------
+- Increment the VERSION file to a major or minor point release.
+- Initiate a jenkins job to build components (WIP: searching).
+- Verify a `tag <https://github.com/opencord/voltctl/tags>`_ named for the version was created.
+- `Released version <https://api.github.com/repos/opencord/voltctl/releases/latest>`_ consumed by jenkins installer  vars/installVoltctl.groovy.
+
+|
+
+Create an official voltctl release
+----------------------------------
+- `installVoltctl.groovy <https://gerrit.opencord.org/plugins/gitiles/ci-management/+/refs/heads/master/vars/installVoltctl.groovy#53>`_
+  depends on `releases/latest <https://api.github.com/repos/opencord/voltctl/releases/latest>`_ for versioned release information.
+
+   - To generate a release visit `github <https://github.com/opencord/voltctl>`_.
+   - Click `Releases <https://github.com/opencord/voltctl/releases>`_ in the right margin.
+
+     - Click "Draft a new release"
+     - Select a tag name to base the release on.
+     - Title the relese and enter a description (release notes).
+     - Select the checkbox "Set as the latest release".
+     - Verify release information in the right margin upon return to the main repository screen.
+
+- Verify the release version contains a checksum file:
+
+   - checksum.SHA256
+   - voltctl-1.7.6-darwin-amd64
+   - voltctl-1.7.6-linux-amd64
+   - voltctl-1.7.6-linux-arm64
+   - voltctl-1.7.6-windows-amd64
+   - Source code (zip)
+   - Source code (tar.gz)
+
+:ref:`voltctl-see-also`