Add callouts for SAN user mapping with x509 cert auth

[jhlodin]

https://cockroachlabs.atlassian.net/browse/DOC-15049

[netlify]

✅ Deploy Preview for cockroachdb-interactivetutorials-docs canceled.

Name	Link
🔨 Latest commit	f58bd24
🔍 Latest deploy log	https://app.netlify.com/projects/cockroachdb-interactivetutorials-docs/deploys/69b85fe98a5af800084cede2

[netlify]

✅ Deploy Preview for cockroachdb-api-docs canceled.

Name	Link
🔨 Latest commit	f58bd24
🔍 Latest deploy log	https://app.netlify.com/projects/cockroachdb-api-docs/deploys/69b85fe9ab3ba90008dd3896

[github-actions]

Files changed:

• src/current/v26.2/certificate-based-authentication-using-the-x509-subject-field.md

[netlify]

✅ Netlify Preview

Name	Link
🔨 Latest commit	f58bd24
🔍 Latest deploy log	https://app.netlify.com/projects/cockroachdb-docs/deploys/69b85fe93087a20008925391
😎 Deploy Preview	https://deploy-preview-23112--cockroachdb-docs.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.