fix(tem): update quickstart

Author: ldecarvalho-doc

pages/transactional-email/quickstart.mdx

@@ -40,7 +40,6 @@ In this quickstart, we show you how to configure your domain with Transactional
  You need to configure your [SPF](/transactional-email/concepts/#spf-record), [DKIM](/transactional-email/concepts/#dkim-record), [MX](/transactional-email/concepts/#mx-record) and [DMARC](/transactional-email/concepts/#dmarc-record) records to verify your external domain and to be able to send emails.
 </Message>
 
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 ## How to add SPF and DKIM records to your domain
 
 After you have configured your domain with Transactional Email, you are prompted to verify your domain by adding SPF, DKIM and MX records. You can choose to do so right after you have validated your domain, or at a later time.