add fireredtts2 demo disclaimer

Author: francissfy

demos/firered_tts_2/index.html

@@ -132,6 +132,11 @@ <h2>FireRedTTS-2: Towards Long Conversational Speech Generation for Podcast and
 
                 <div class="container pt-5 mt-5 shadow-lg p-5 mb-5 bg-white rounded">
                     <h2 id="app-video" style="text-align: center;">Video Demo</h2>
+                    <p style="text-align: center;">
+                        ⚠️ Speaker voices: hosts "肥杰" and "惠子" from the podcast "肥话连篇". Use without authorization is forbidden.
+                        <br>
+                        ⚠️ 声音来源：播客 "肥话连篇" 主播 "肥杰" 和 "惠子"，未经授权不能使用。
+                    </p>
                     <div class="video-container">
                         <video controls>
                             <source