corrected case study titles to be title case

[craigmcginley]

✅ Deploy Preview for goinvocom ready!

Name	Link
🔨 Latest commit	134d7375270e89465c68c2e79c9894c05cc7ad3d
🔍 Latest deploy log	https://app.netlify.com/sites/goinvocom/deploys/65e886e41600a3000865798a
😎 Deploy Preview	https://deploy-preview-492--goinvocom.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.