[jeffa5]

Summary

Updates the Rate Limiting binding page to document the optional delta option for limit(), which counts a call as more than one request. Adds the syntax, default, validation errors, a weighted example, and how weighted calls affect the limit decision.

Draft until local development support (cloudflare/workers-sdk#16650) and types (cloudflare/workerd#8144) are released. The minimum Wrangler version and a changelog entry will be added then.

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.

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