update securesignalsapp labels + check readme

Author: eiman-eltigani-ttd

examples/google-secure-signals-integration/react_client_side/src/SecureSignalsApp.tsx

@@ -383,15 +383,15 @@ const SecureSignalsApp = () => {
           </div>
           <div>
             <button type='button' className='button' onClick={handleLogin}>
-              Log In
+              Generate UID2
             </button>
           </div>
         </div>
       ) : (
         <div id='logout_form' className='form'>
           <form>
             <button type='button' className='button' onClick={handleLogout}>
-              Log Out
+              Clear UID2
             </button>
           </form>
         </div>