Begin documenting how to build and release voltctl

Change-Id: Icbfb50fdf69e608281ee0af62b7501240c5d875c
diff --git a/howto/index.rst b/howto/index.rst
index 0167429..1f23a6c 100644
--- a/howto/index.rst
+++ b/howto/index.rst
@@ -6,5 +6,5 @@
 
    code/index
    edit_voltha_docs
-   release/installVoltctl
+   release/index
    voltha_repositories