fix more

app.py

@@ -369,7 +369,7 @@ with block:
               </div>
               <p style="margin-bottom: 10px; font-size: 94%; line-height: 23px;">
                 Stable Diffusion 2.1 Demo App. <br />
-                Click "Generate image" Button to generate image. <br />
+                Click <strong>Generate image</strong> Button to generate image. <br />
                 Also Change params to have a try <br />
                 512*512 is optimized, every image will cost 30s. <br />
                 other size may cost more time. <br />