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

Change-Id: I5db8220a95bc0a0b2b360db5588d70ef763e4599
diff --git a/howto/release/voltctl/index.rst b/howto/release/voltctl/index.rst
new file mode 100644
index 0000000..99b00f7
--- /dev/null
+++ b/howto/release/voltctl/index.rst
@@ -0,0 +1,10 @@
+HOWTO(s)
+========
+
+.. toctree::
+   :maxdepth: 2
+
+   release/voltctl/install
+   release/voltctl/release
+
+:ref:`voltctl-see-also`