[WR] Adds FAQ to WR docs

[angelampcosta]

Summary

Adds FAQ to WR docs.

Documentation checklist

• The documentation style guide has been adhered to.

[hyperlint-ai]

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PR Change Summary

Added an FAQ section to the Waiting Room documentation to address user inquiries regarding traffic thresholds and system behavior.

• Introduced a new FAQ section in the Waiting Room documentation.
• Explained the reasons for traffic exceeding the New Users Per Minute threshold.
• Clarified the budgeting logic for new users in a distributed system.

Modified Files

• src/content/docs/waiting-room/troubleshooting.mdx

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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/waiting-room/	@angelampcosta, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://3c66b751.preview.developers.cloudflare.com
Preview Branch URL: https://angela-update-faq.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/waiting-room/troubleshooting/	https://angela-update-faq.preview.developers.cloudflare.com/waiting-room/troubleshooting/