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

Change-Id: I5db8220a95bc0a0b2b360db5588d70ef763e4599
diff --git a/howto/release/voltctl/install.rst b/howto/release/voltctl/install.rst
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+Command: installVoltctl.groovy
+==============================
+
+Release Notes
+-------------
+The `repo:ci-management :: vars/installVoltctl.groovy <https://gerrit.opencord.org/plugins/gitiles/ci-management/+/refs/heads/master/vars/installVoltctl.groovy>`_ script is used to install a versioned voltctl binary when working with LTS or an older released version.
+
+During release the install program will require an edit to capture the HEAD version of voltctl.
+
+See Also
+--------
+   * `vars/installVolthactl.groovy <https://gerrit.opencord.org/plugins/gitiles/ci-management/+/refs/heads/master/vars/installVoltctl.groovy>`_
+   * `VOLTHA Release Process <https://docs.voltha.org/master/release_notes/release_process.html?highlight=release>`_
+
+:ref:`voltctl-see-also`