Update k8s/tutorials-index.md to add a period

[netlify[bot]]

✅ Deploy Preview for cdk-next ready!

Name	Link
🔨 Latest commit	f186e52c4e184b81a96bce207a5439333cc5bfbf
🔍 Latest deploy log	https://app.netlify.com/sites/cdk-next/deploys/67127dd16fa3ad00081142db
😎 Deploy Preview	https://deploy-preview-865--cdk-next.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 site configuration.

[addyess]

@evilnick you're thoughts?