Fix indentation in navbar list items

This is to settle the formatting issue raised by @davidlehn

Author: iherman

2024/json-ld-wg/index.html

@@ -55,7 +55,7 @@
           <li><a href="#background">Background</a></li>
           <li><a href="#scope">Scope</a></li>
           <li><a href="#deliverables">Deliverables</a></li>
-		      <li><a href="#success-criteria">Success Criteria</a></li>
+          <li><a href="#success-criteria">Success Criteria</a></li>
           <li><a href="#coordination">Coordination</a></li>
           <li><a href="#participation">Participation</a></li>
           <li><a href="#communication">Communication</a></li>