integrations: Update IFTTT doc.

zerver/webhooks/ifttt/doc.md

@@ -1,10 +1,13 @@
-Get notifications from every event supported by IFTTT!
+IFTTT supports integrations with hundreds of
+[physical and digital products](https://ifttt.com/services), like
+dishwashers, cars, web services, and more. Get IFTTT notifications directly
+in Zulip.
 
 1. {!create-stream.md!}
 
 1. {!create-bot-construct-url-indented.md!}
 
-1. Next, create an IFTTT Applet and select the service you'd like
+    1. Create an [IFTTT account](https://ifttt.com/join). Select the service you'd like
    to receive notifications from as `this`. Select **Webhooks** as
    `that`. Select the **Make a web request** action.
 
@@ -18,3 +21,5 @@ Get notifications from every event supported by IFTTT!
     customize the topic and content of your messages. Click **Add ingredient**
     to see the available options and customize the `content` and `topic`
     parameters as necessary. Click **Create action**, and click **Finish**.
+
+**Congratulations! You're done!**