Update error description to note reduced scope

Author: RebeccaTamachiro

src/content/docs/cloudflare-for-platforms/cloudflare-for-saas/reference/status-codes/custom-hostnames.mdx

@@ -36,7 +36,7 @@ head:
 | 400              | 1409           | Reserved top domain custom hostnames, such as 'test', 'example', 'invalid' or 'localhost', is not supported. Check your input and try again.                                                                                                                                                                                                                                                                   |
 | 400              | 1410           | Unable to parse custom hostname - `:reason`. Check your input and try again. <br/> **Reasons:** <br/> publicsuffix: cannot derive eTLD+1 for domain `:domain` <br/> publicsuffix: invalid public suffix `:suffix` for domain `:domain`                                                                                                                                                                         |
 | 400              | 1411           | Custom hostnames ending in example.com, example.net, or example.org are prohibited. Check your input and try again.                                                                                                                                                                                                                                                                                            |
-| 400              | 1412           | Custom metadata for wildcard custom hostnames is not supported. Check your input and try again.                                                                                                                                                                                                                                                                                                                |
+| 400              | 1412           | Custom metadata for wildcard custom hostnames is not supported. Check your input and try again. <br/> **Note:** <br/> This message is only presented to customers who have opted out of wildcard support for custom metadata.                                                                                                                                                                                                                                                                                                              |
 | 400              | 1415           | Invalid custom origin hostname. Custom origin hostnames have to be smaller than 256 characters in length, cannot be IP addresses, cannot contain any special characters such as ~~\`\`~~\`!@#$%^&\*()=+{}\[]\\                                                                                                                                                                                                 |
 | 400              | 1416           | Custom origin hostnames with non-ASCII characters are not supported. Check your input and try again.                                                                                                                                                                                                                                                                                                           |
 | 400              | 1417           | Reserved top domain custom origin hostnames, such as 'test', 'example', 'invalid' or 'localhost', is not supported. Check your input and try again.                                                                                                                                                                                                                                                            |