Update stripe_plugin.adoc

Author: sbrossie

userguide/tutorials/stripe_plugin.adoc

@@ -198,7 +198,7 @@ Now, you can run the app using your Stripe publishable key:
 $ KB_URL='http://<KILL_BILL_CONTAINER_IP>:8080' PUBLISHABLE_KEY=<YOUR_PUBLISHABLE_STRIPE_KEY> ruby app.rb
 ----
 
-In your browser, navigate to `http://localhost:4567/` and click the 'Buy' button.
+In your browser, navigate to \http://localhost:4567/ and click the 'Buy' button.
 
 Enter dummy data (4242 4242 4242 4242 as the credit card number, any three digit CVC and any expiry date in the future work) and complete the checkout process.