copy edit: parallelism: Madison Top Resources, UW System Top Resources

Adjust section heading so that Madison and non-Madison heading use parallel structure, both "{Context} Top Resources".

The Madison heading:

The System heading before this change:

The System heading after this change:

myuw-root-webapp/src/main/webapp/500.html

@@ -94,7 +94,7 @@
 
               <!-- UW SYSTEM LINKS -->
               <div id="service-links__uw-system">
-                <h4>Top UW System Resources (non-Madison schools)</h4>
+                <h4>UW System Top Resources (non-Madison schools)</h4>
                 <h5>Apps</h5>
                 <ul role="menu" aria-labelledby="service-links__uw-system">
                   <li role="menuitem"><a href="https://uws.instructure.com/">Canvas</a></li>