[css-text] Fix stray text from when word-spacing took percentages

Part of w3c#2165

Author: frivoal

css-text-3/Overview.bs

@@ -2876,14 +2876,6 @@ Minimum Requirements for ''text-justify/auto'' Justification</h4>
   <p>CSS offers control over text spacing
   via the 'word-spacing' and 'letter-spacing' properties, which specify additional space
   around <a>word separators</a> or between <a>typographic character units</a>, respectively.
-  The 'word-spacing' property can now be specified in percentages,
-  making it possible to, for example, double or eliminate word spacing.
-
-  <div class="example">
-    <p>In the following example, word spacing is halved,
-    but may expand if needed for text justification.
-    <pre>p { word-spacing: -50%; }</pre>
-  </div>
 
 <h3 id="word-spacing-property" oldids="word-spacing">
 Word Spacing: the 'word-spacing' property</h3>