Fix a link to the HR-TIME spec (#308)

* Fix a link to the HR-TIME spec

* Fix respec error on 'supportedEntryTypes'

* Clean up old xref

* Reference HR-TIME spec implicitly instead of with a 'data-cite'

Author: tommckee1

index.html

@@ -65,7 +65,7 @@
     github: "https://github.com/w3c/resource-timing/",
     caniuse: "resource-timing",
     xref: {
-      specs: ["hr-time-3", "performance-timeline-2", "xhr"],
+      specs: ["hr-time-3", "performance-timeline", "xhr"],
       profile: "web-platform",
     }
     };
@@ -1133,9 +1133,9 @@ <h2>
         <ol>
           <li>If |ts| is zero, return zero.
           </li>
-          <li>Otherwise, return the <a data-cite=
-          "HR-TIME#relative-high-resolution-coarse-time">relative high
-          resolution coarse time</a> given |ts| and |global|.
+          <li>
+            Otherwise, return the [=relative high resolution coarse time=]
+            given |ts| and |global|.
           </li>
         </ol>
       </section>