Fix tl;dr value

Author: captainbrosset

built-in-ai/playgrounds/summarizer-api/index.html

@@ -144,7 +144,7 @@ <h1>Summarizer API</h1>
   <label for="type">Type of summary</label>
   <select name="type" id="type">
     <option value="key-points" selected>Key points</option>
-    <option value="tl;dr">TL;DR</option>
+    <option value="tldr">TL;DR</option>
     <option value="teaser">Teaser</option>
     <option value="headline">Headline</option>
   </select>