[w3c/ServiceWorker] Clarify cache access in Handle Fetch (PR #1786)

The previous wording "the registration’s storage key’s name to cache map" was ambiguous. This change clarifies the mechanism for accessing caches during a fetch event handled by a service worker.

Specifically, it replaces the ambiguous phrase with a direct call to "obtain a local storage bottle map" from the Storage specification, using the reserved client's environment. This makes the process of retrieving the cache map explicit and aligns the specification with modern storage standards.

This addresses the issue raised in https://github.com/w3c/ServiceWorker/issues/1784


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  https://github.com/w3c/ServiceWorker/pull/1786

-- Commit Summary --

  * Clarify cache access in Handle Fetch

-- File Changes --

    M docs/index.bs (3)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1786.patch
https://github.com/w3c/ServiceWorker/pull/1786.diff

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