[w3c/ServiceWorker] Correcting usecache attribute. Fixes #1069 (#1070)

I also did the same for the header. I assume we handle booleans the same way there?
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1070

-- Commit Summary --

  * Correcting usecache attribute. Fixes #1069

-- File Changes --

    M docs/index.bs (6)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1070.patch
https://github.com/w3c/ServiceWorker/pull/1070.diff

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https://github.com/w3c/ServiceWorker/pull/1070