add reconciliation concepts and links to improve clarity

[thadguidry]

• Adds additional context and aliases and provides a useful link to Wikiversity on the topic of record linkage and duplicate record detection and various matching algorithms.
• The Wikiversity link should probably also be added to our clustering doc page.

[netlify[bot]]

✅ Deploy Preview for openrefine-website ready!

Name	Link
🔨 Latest commit	29d81e1ba5d045ba9f589ebcc20c73e202ab09fb
🔍 Latest deploy log	https://app.netlify.com/sites/openrefine-website/deploys/66612b28e815380008e89c81
😎 Deploy Preview	https://deploy-preview-345--openrefine-website.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.