There are no useful template hooks inside the tab at that position, but you can place the notice above the tab if you are doing this with a plugin.
If you were doing this with a template edit, I don't think you would be asking if it's possible.
If you were doing this with vBulletin's notice system, the notice would appear above all wiki pages except the one in your screenshot.
To do it with a plugin, I would recommend something similar to the following, where 'my_notice' is the name of the template that contains your notice:
Hook: vault_showthread_getinfo
Code:
if (!$_POST['ajax'])
{
$ad_location['global_below_navbar'] .= vB_Template::create('my_notice')->render();
}
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