[user-guide] Add new line before code-block directive

A new line is required before code-block directive
to be rendered properly.

Change-Id: If5c02d82e68106304ed08248e209c0dd97546e35

doc/user-guide/source/cli_launch_instances.rst

@@ -200,6 +200,7 @@ Launch an instance from an image
 
    Depending on the parameters that you provide, the command returns a list
    of server properties.
+
    .. code-block:: console
 
       +-------------------------------------+-------------------------------------+