[w3c/ServiceWorker] Remove duplicate step from "Update" algorithm (#1132)

The `Service-Worker` header is appended to the request's header list in
a prior algorithm step.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1132

-- Commit Summary --

  * Remove duplicate step from "Update" algorithm

-- File Changes --

    M docs/index.bs (4)
    M docs/index.html (3)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1132.patch
https://github.com/w3c/ServiceWorker/pull/1132.diff

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https://github.com/w3c/ServiceWorker/pull/1132