[css-text] Add info on new tests

Author: frivoal

css-text-3/Overview.bs

@@ -2728,6 +2728,11 @@ Line Breaking Details</h3>
       However, inline element boundaries
       must be ignored when determining word boundaries.
 
+      <wpt>
+        hyphens/hyphens-span-001.html
+        hyphens/hyphens-span-002.html
+      </wpt>
+
     <p class="advisement">
       Authors should correctly tag their content’s <a lt="content language">language</a>
       (e.g. using the HTML <code>lang</code> attribute