[w3c/ServiceWorker] Editorial: Correct grammar of informative note (#1145)

I'm not sure if the language "x has been the target of a y event" is
conventional, but I haven't been able to find similar text in any other
specification. Happy to re-phrase as the editors please.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1145

-- Commit Summary --

  * Editorial: Correct grammar of informative note

-- File Changes --

    M docs/index.bs (2)
    M docs/index.html (2)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1145.patch
https://github.com/w3c/ServiceWorker/pull/1145.diff

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/w3c/ServiceWorker/pull/1145