Bug 33126: Markup error in staff interface tab wrapper

Bug 33126: Markup error in staff interface tab wrapper

This patch makes a minor correction to the tab WRAPPER directives: a
<li> which should be </li>.

The patch also modifies the example WRAPPER markup to correct an error
and clarify usage.

To test, apply the patch and test a page which has been updated to use
tab wrappers: The about page, basket groups, library transfer limits.
Tabs should continue to work as expected.

Before the patch, the about page source will include this:

<li role="presentation" class="active">
    <a href="about_panel" aria-controls="about_panel" role="tab" data-toggle="tab">
       Server information
    </a>
<li>

After the patch the closing </li> will be correct.

Signed-off-by: Sally <sally.healey@cheshiresharedservices.gov.uk>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>