Fixing Markdown

doc/settings/smtp.md

@@ -778,6 +778,7 @@ gitlab_rails['smtp_tls'] = false
 gitlab_rails['smtp_openssl_verify_mode'] = 'none'
 gitlab_rails['gitlab_email_from'] = 'gitlab@example.com'
 gitlab_rails['gitlab_email_reply_to'] = 'noreply@example.com'
+```
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