feat(docs): add exclusive rules and fix headings

[ematipico]

Summary

• Added a new heading on the rule sources page to highlight our exclusive rules
• Fixed some headings in the docs of the lint rules: from ## Valid to ### Valid

Test Plan

Check the deployed website

[netlify]

✅ Deploy Preview for biomejs ready!

Name	Link
🔨 Latest commit	9f63c04
🔍 Latest deploy log	https://app.netlify.com/sites/biomejs/deploys/65aa73ec9bfffd00082634dc
😎 Deploy Preview	https://deploy-preview-1602--biomejs.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 100 (🟢 up 1 from production) Accessibility: 97 (no change from production) Best Practices: 100 (no change from production) SEO: 93 (no change from production) PWA: - View the detailed breakdown and full score reports

---

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

[github-actions]

Parser conformance results on

js/262

Test result	main count	This PR count	Difference
Total	49701	49701	0
Passed	48721	48721	0
Failed	980	980	0
Panics	0	0	0
Coverage	98.03%	98.03%	0.00%

jsx/babel

Test result	main count	This PR count	Difference
Total	40	40	0
Passed	37	37	0
Failed	3	3	0
Panics	0	0	0
Coverage	92.50%	92.50%	0.00%

symbols/microsoft

Test result	main count	This PR count	Difference
Total	6322	6322	0
Passed	2036	2036	0
Failed	4286	4286	0
Panics	0	0	0
Coverage	32.20%	32.20%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	662	662	0
Passed	592	592	0
Failed	70	70	0
Panics	0	0	0
Coverage	89.43%	89.43%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	17646	17646	0
Passed	13452	13452	0
Failed	4192	4192	0
Panics	2	2	0
Coverage	76.23%	76.23%	0.00%

[codspeed-hq]

CodSpeed Performance Report

Merging #1602 will improve performances by 6.28%

_{⚠️ No base runs were found}

_{Falling back to comparing docs/headings-and-more-info (9f63c04) with main (44ebe0c)}

Summary

⚡ 1 improvements
✅ 92 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	docs/headings-and-more-info	Change
⚡	big5-added.json[uncached]	3 ms	2.9 ms	+6.28%