BD-2937: Update link and add redirect

_docs/_user_guide/message_building_by_channel/sms/about_sms.md

@@ -31,7 +31,7 @@ Before you start sending SMS, there are some things you need. Refer to the follo
 
 |Requirement | Description | Acquirement |
 |---|---|---|
-| A dedicated phone number (either a Short Code or Long Code) | A dedicated phone number provided exclusively to a single brand or host. | Braze handles acquiring these numbers for you. Learn more about [short and long codes]({{site.baseurl}}/user_guide/message_building_by_channel/sms/phone_numbers/sending_phone_numbers/).|
+| A dedicated phone number (either a Short Code or Long Code) | A dedicated phone number provided exclusively to a single brand or host. | Braze handles acquiring these numbers for you. Learn more about [short and long codes]({{site.baseurl}}/user_guide/message_building_by_channel/sms/sms_setup/short_and_long_codes/).|
 | List of users with phone numbers | Before you can start sending messages, you must add users to your account. Additionally, you must know the approximate size of your audience.  | Users are initially added to Braze through our backend. You must pass this list to us to upload for you. Phone numbers must be formatted as a 10-digit number, as well as a country area code. Learn more about [user phone numbers]({{site.baseurl}}/user_guide/message_building_by_channel/sms/phone_numbers/user_phone_numbers/). |
 | [SMS keywords and responses]({{site.baseurl}}/user_guide/message_building_by_channel/sms/keywords/) | All base keywords must have responses attributed to it before you can begin messaging | You should list these out and send them to your Braze representative or onboarding manager during your onboarding process. View [SMS keyword templates]({{site.baseurl}}/user_guide/message_building_by_channel/sms/phone_numbers/sending_phone_numbers/#short-code-application). |
 {: .reset-td-br-1 .reset-td-br-2 .reset-td-br-3}