Update Server_Deployment.ipynb (#2118)

Fixed small typo. If using `??` the binder takes you to the notebook selection page instead of panel deployment.

examples/user_guide/Server_Deployment.ipynb

@@ -111,7 +111,7 @@
     "\n",
     "3. Go to mybinder.org, enter the URL of your GitHub repository and hit ``Launch``\n",
     "\n",
-    "4. mybinder.org will give you a link to the deployment, e.g. for the example app it is https://mybinder.org/v2/gh/panel-demos/clifford-interact/master. To visit the app simply append ``??urlpath=/panel/clifford`` where you should replace clifford with the name of the notebook or script you are serving.\n",
+    "4. mybinder.org will give you a link to the deployment, e.g. for the example app it is https://mybinder.org/v2/gh/panel-demos/clifford-interact/master. To visit the app simply append ``?urlpath=/panel/clifford`` where you should replace clifford with the name of the notebook or script you are serving.\n",
     "\n",
     "\n",
     "#### Heroku\n",