[DO] Adding explanation on duration billing of a DO.

[Oxyjun]

Summary

1. Added "When does a Durable Object incur duration charges?" to the Billing FAQ.
2. Minimally reworded a footnote in the Compute billing footnote, which now references the newly added FAQ heading.
3. Removed glossary term "request context" from DO glossary (until we can come up with a more accurate explanation).
4. Removed GlossaryTooltip from pointing to the deleted "request context" definition.

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Enhanced the Durable Objects documentation with new billing explanations and glossary updates.

• Added a new FAQ section on duration billing for Durable Objects.
• Updated references in the Compute billing section to align with the new FAQ.
• Removed the glossary term 'request context' and its associated tooltip.

Modified Files

• src/content/docs/durable-objects/api/state.mdx
• src/content/docs/durable-objects/platform/pricing.mdx
• src/content/partials/durable-objects/durable-objects-pricing.mdx

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[github-actions]

Preview URL: https://e1148b8f.preview.developers.cloudflare.com
Preview Branch URL: https://jun-do-billing-do-lifecycle-details.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/durable-objects/platform/pricing/	https://jun-do-billing-do-lifecycle-details.preview.developers.cloudflare.com/durable-objects/platform/pricing/
https://developers.cloudflare.com/durable-objects/api/state/	https://jun-do-billing-do-lifecycle-details.preview.developers.cloudflare.com/durable-objects/api/state/

[Oxyjun]

@joshthoward @vy-ton could I get your eyes on this before merging?

[vy-ton]

Plan to review this today