editorial formatting for credit dialogue

src/app/dialogs/credits-dialog.component.html

@@ -4,7 +4,7 @@
     <li><span><strong>Project Sponsor:</strong> Microsoft</span></li>
     <li><span><strong>Project Lead:</strong> Alex Li</span></li>
     <li><span><strong>Original Mapping Contributors:</strong> ISO/IEC JTC 1 SC27 for GDPR; Alex Li, Alec Christie and his Digital Law team (currently at Mills Oakley)</span></li>
-    <li><span><strong>Data Curators:</strong> Joyce Chua, Eric Lachaud, Alex Li,and James Wong</span></li>
+    <li><span><strong>Data Curators:</strong> Joyce Chua, Eric Lachaud, Alex Li, and James Wong</span></li>
     <li><span><strong>Code Committers:</strong> Alex Li</span></li>
   </ul>
 </mat-dialog-content>