docs: add useful debug CLI

Change-Id: I5ef9ecd741f1623ae1b7a23fa0a4fa6db7e243a3
Signed-off-by: Scott Keeler <skeeler@cisco.com>
diff --git a/docs/reference/cmdreference/show/index.rst b/docs/reference/cmdreference/show/index.rst
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+.. _interface:
+
+.. note:: For a complete list of CLI Debug commands refer to the Debug CLI section of the `Source Code Documents <https://docs.fd.io/vpp/18.07/clicmd.html>`_ .
+
+Show Commands
+==================
+This section identifies the following types of show commands:
+
+.. toctree::
+   :maxdepth: 2
+
+   show
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