Fix stray backticks in speech-synthesis (#44)

https://chatgpt.com/s/cd_687fc7bf63e881919051e0e74967192d

Author: simonw

speech-synthesis.html

@@ -159,7 +159,6 @@
   <div class="container">
     <h1>Speech synthesis tester</h1>
 
-```
 <div class="form-group">
   <label for="textInput">Text to speak:</label>
   <textarea id="textInput" placeholder="Enter text to be spoken...">Hello, this is a test of the speech synthesis API!</textarea>
@@ -198,7 +197,6 @@ <h1>Speech synthesis tester</h1>
 </div>
 
 <div class="status ready" id="status">Ready to speak</div>
-```
 
   </div>