Merge pull request #8246 from braze-inc/bd-3563

BD-3563 Update CTIA PDF link

_docs/_user_guide/message_building_by_channel/sms/sms_laws_and_regulations.md

@@ -43,7 +43,7 @@ There are the six rules you should follow:
 
 Here are some links you might need to consult as you build up your SMS campaign:
 
-- [CTIA's Messaging Principles and Best Practices for 2019](https://api.ctia.org/wp-content/uploads/2019/07/190719-CTIA-Messaging-Principles-and-Best-Practices-FINAL.pdf)
+- [CTIA's Messaging Principles and Best Practices for 2023](https://api.ctia.org/wp-content/uploads/2023/05/230523-CTIA-Messaging-Principles-and-Best-Practices-FINAL.pdf)
 - [Twilio's Guide to US SMS Compliance](https://www.twilio.com/learn/call-and-text-marketing/guide-to-us-sms-compliance)
 - [Acoustic's United States SMS compliance and resources](https://help.goacoustic.com/hc/en-us/articles/360043717414-United-States-SMS-compliance-and-resources)