[mirotalksfu] - add docs

public/view/Room.html

@@ -365,7 +365,7 @@ access to use this app.
                         <i class="fas fa-smile"></i>
                     </button>
                     <button id="chatShareFileButton" class="hidden">
-                        <i class="fas fa-file"></i>
+                        <i class="fas fa-paperclip"></i>
                     </button>
                     <button id="chatSpeechStartButton" class="hidden">
                         <i class="fas fa-microphone-slash"></i>