docs(realtimekit): added billing FAQs for RealtimeKit product

[ravindra-cloudflare]

Summary

Added Billing FAQs for realtimekit product.

Documentation checklist

• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

Review

✅ No issues found in commit a600310.

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/realtime/	@ravindra-cloudflare, @roerohan, @cloudflare/realtime, @cloudflare/RealtimeKit, @cloudflare/product-owners

[cloudflare-workers-and-pages]

🚀 Deploying Preview to Cloudflare 🚀

Preview URL: https://realtimekit-billing-faqs.previews.developers.cloudflare.com (commit a600310)

This URL reflects your latest Preview deployment

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Status	Deployment URL	Commit	Updated (UTC)	See this deployment's details
Build: Success ✅ Deployment: Success ✅ View logs ↗	https://aed9e383.previews.developers.cloudflare.com	a600310	2026-09-11T11:56:32.444Z	Visit the dashboard ↗
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[ToxicityMax]

LGTM

[github-actions]

Preview URL: https://a6003107.preview.developers.cloudflare.com
Preview Branch URL: https://realtimekit-billing-faqs.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/realtime/realtimekit/faq/	https://realtimekit-billing-faqs.preview.developers.cloudflare.com/realtime/realtimekit/faq/