Add slice ID to example data

Contributes to issue CURA-9031.

plugins/SliceInfoPlugin/example_data.html

@@ -9,6 +9,7 @@
     <b>Using Custom Settings:</b> No<br/>
     <b>Is Logged In:</b> Yes<br/>
     <b>Organization ID (if any):</b> ABCDefGHIjKlMNOpQrSTUvYxWZ0-1234567890abcDE=<br/>
+    <b>Slice ID:</b> aBcDeF01-2345-6789-aBcD-eF0123456789<br/>
     <b>Subscriptions (if any):</b>
     <ul>
         <li><b>Level:</b> 10, <b>Type:</b> Enterprise, <b>Plan:</b> Basic</li>