[cssom-view] remove eroneous HDR example, closes w3c#5378

Author: svgeesus

cssom-view-1/Overview.bs

@@ -908,19 +908,6 @@ compatibility reasons.
 
 Note: Some non-conforming implementations are known to return 32 instead of 24.
 
-<div class='example'>
-  <code>colorDepth</code> can be used in the context of selecting SDR/HDR in
-  addition with other information. For example, combined with color gamut.
-
-  <pre highlight=javascript>
-  if (screen.colorDepth >= 48   && window.matchMedia('(color-gamut: p3)').matches &&
-      /* other checks */) {
-    // Use HDR content.
-  } else {
-    // Use SDR content.
-  }
-  </pre>
-</div>
 
 <h2 id=extensions-to-the-document-interface>Extensions to the {{Document}} Interface</h2>