Clarify CONTRIBUTING.md

[gregberge]

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[changeset-bot]

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Latest commit: 6e13bbd

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-98cj6ppzi-gitbook.vercel.app	✅
Cloudflare	https://8d4cb5ff-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-98cj6ppzi-gitbook.vercel.app/url/gitbook.com/docs	https://8d4cb5ff-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-98cj6ppzi-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://8d4cb5ff-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers-v2 (Inspect)	👍 Changes approved	1 changed	Oct 19, 2025, 1:22 PM
v2-cloudflare (Inspect)	✅ No changes detected	-	Oct 19, 2025, 1:25 PM
v2-vercel (Inspect)	👍 Changes approved	1 changed	Oct 19, 2025, 1:25 PM