Remove more references to 'whitelabel'

Signed-off-by: chandler <chandler@chandlerweiner.com>

Author: crweiner

USAGE.md

@@ -2315,7 +2315,7 @@ A single IP address or a range of IP addresses may be dedicated to an account in
 
 IP Pools allow you to group your dedicated SendGrid IP addresses together. For example, you could create separate pools for your transactional and marketing email. When sending marketing emails, specify that you want to use the marketing IP pool. This allows you to maintain separate reputations for your different email traffic.
 
-IP pools can only be used with whitelabeled IP addresses.
+IP pools can only be used with authenticated IP addresses.
 
 If an IP pool is NOT specified for an email, it will use any IP available, including ones in pools.
 
@@ -2343,7 +2343,7 @@ If an IP pool is NOT specified for an email, it will use any IP available, inclu
 
 IP Pools allow you to group your dedicated SendGrid IP addresses together. For example, you could create separate pools for your transactional and marketing email. When sending marketing emails, specify that you want to use the marketing IP pool. This allows you to maintain separate reputations for your different email traffic.
 
-IP pools can only be used with whitelabeled IP addresses.
+IP pools can only be used with authenticated IP addresses.
 
 If an IP pool is NOT specified for an email, it will use any IP available, including ones in pools.
 
@@ -2370,7 +2370,7 @@ If an IP pool is NOT specified for an email, it will use any IP available, inclu
 
 IP Pools allow you to group your dedicated SendGrid IP addresses together. For example, you could create separate pools for your transactional and marketing email. When sending marketing emails, specify that you want to use the marketing IP pool. This allows you to maintain separate reputations for your different email traffic.
 
-IP pools can only be used with whitelabeled IP addresses.
+IP pools can only be used with authenticated IP addresses.
 
 If an IP pool is NOT specified for an email, it will use any IP available, including ones in pools.
 
@@ -2398,7 +2398,7 @@ If an IP pool is NOT specified for an email, it will use any IP available, inclu
 
 IP Pools allow you to group your dedicated SendGrid IP addresses together. For example, you could create separate pools for your transactional and marketing email. When sending marketing emails, specify that you want to use the marketing IP pool. This allows you to maintain separate reputations for your different email traffic.
 
-IP pools can only be used with whitelabeled IP addresses.
+IP pools can only be used with authenticated IP addresses.
 
 If an IP pool is NOT specified for an email, it will use any IP available, including ones in pools.
 
@@ -2425,7 +2425,7 @@ If an IP pool is NOT specified for an email, it will use any IP available, inclu
 
 IP Pools allow you to group your dedicated SendGrid IP addresses together. For example, you could create separate pools for your transactional and marketing email. When sending marketing emails, specify that you want to use the marketing IP pool. This allows you to maintain separate reputations for your different email traffic.
 
-IP pools can only be used with whitelabeled IP addresses.
+IP pools can only be used with authenticated IP addresses.
 
 If an IP pool is NOT specified for an email, it will use any IP available, including ones in pools.
 
@@ -4229,7 +4229,7 @@ For more information, please see our [User Guide](https://sendgrid.com/docs/ui/a
   ```
 ## Associate a Link Branding
 
-**This endpoint allows you to associate a link whitelabel with a subuser account.**
+**This endpoint allows you to associate a link branding with a subuser account.**
 
 Link branding can be associated with subusers from the parent account. This functionality allows
 subusers to send mail using their parent's link brands. To associate a link branding, the parent account
@@ -4532,7 +4532,7 @@ Each subuser should be assigned to an IP address, from which all of this subuser
 More information:
 
 * [How to request more IPs](https://sendgrid.com/docs/Classroom/Basics/Account/adding_an_additional_dedicated_ip_to_your_account.html)
-* [IPs can be whitelabeled](https://sendgrid.com/docs/User_Guide/Settings/Whitelabel/ips.html)
+* [How to set up reverse DNS](https://sendgrid.com/docs/ui/account-and-settings/how-to-set-up-reverse-dns/)
 
 ### PUT /subusers/{subuser_name}/ips