Comparison operator reference and minor fixes

[gramian]

• Add note about debug option (Section 7.11)
• Complete comparison operator reference (Section 11.5)
• Make graph render (Section 11.6)

[netlify[bot]]

✅ Deploy Preview for laughing-saha-bb44e9 ready!

Name	Link
🔨 Latest commit	b14249d9c161c0e2cb04ff102b6599246833f435
🔍 Latest deploy log	https://app.netlify.com/sites/laughing-saha-bb44e9/deploys/664ae34db5d8bd00085a43c8
😎 Deploy Preview	https://deploy-preview-265--laughing-saha-bb44e9.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.

[lvca]

Thanks!