[w3c/ServiceWorker] service worker client definition is redundant (#1046)

8b483b091e0f0bae6b698cf05d915c2029748ae0 changed the definition of a service worker client to "`a type of <a>environment</a> or <a>environment settings object</a>`" which is redundant, since every environment settings object [is itself also an environment](https://html.spec.whatwg.org/multipage/webappapis.html#environment-settings-object), so this confusingly implies they don't have an is-a relationship. Also, the 'type of' wording from https://github.com/w3c/ServiceWorker/issues/832#issuecomment-183513422 https://github.com/w3c/ServiceWorker/commit/c11942b04873c1980016b347abe61e7ae0e5ad21 seems redundant and potentially confusing, isn't it more straightforward to just say "a service worker client is an environment [that...]"?

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