Add Link to Twilio International Phone Number Docs

Author: pwseg

src/engage/onboarding.md

@@ -252,14 +252,12 @@ To finish setting up your Messaging Service, you’ll now [configure an event we
 
 ## Stage 4: Create and configure Twilio WhatsApp services
 
-> info "WhatsApp Public Beta"
-> WhatsApp as an Engage channel is in public beta. 
-
 To send WhatsApp messages in Twilio Engage, you'll register a Twilio number with WhatsApp, connect your Facebook account, and create a WhatsApp messaging service.
 
 ### Register a Twilio number with WhatsApp
 
 1. [Purchase an SMS-capable phone number](https://support.twilio.com/hc/en-us/articles/223135247-How-to-Search-for-and-Buy-a-Twilio-Phone-Number-from-Console){:target="_blank"} within your Twilio Console.
+  - For international numbers, view Twilio's [Phone Number Regulations](https://www.twilio.com/en-us/guidelines/regulatory){:target="_blank"} guidelines. 
 2. From the Twilio side menu, navigate to **Messaging > Senders > WhatsApp Senders**.
 3. Select **Create new sender**.
 4. From the **New Sender** builder, find **Twilio phone number**, then choose the phone number you purchased in Step 1. Select **Continue**.