fix(tem): fix missing closing tag (scaleway#3851)

Author: bene2k1

managed-services/transactional-email/reference-content/tem-capabilities-and-limits.mdx

@@ -25,6 +25,7 @@ New users may face stricter initial limits, while well-known customers can benef
 
 <Message type="important">
   Customers must adhere to industry standards and our [General Terms of Services](https://www-uploads.scaleway.com/General_Terms_of_Services_v17072024_45d4879c08.pdf), including compliance with [Scaleway's anti-spam policy](https://tem.s3.fr-par.scw.cloud/antispam_policy.pdf). Failure to comply may result in temporary or permanent restrictions to the service.
+</Message>
 
 ## Transactional Email service quotas