[w3c/ServiceWorker] Fix incomplete link (#987)

If “Google Gears” was supposed to be a link (just as Dojo Offline/AppCache are), now it is one. Otherwise, I’d suggest to remove the lonely opening square bracket. ;)
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/987

-- Commit Summary --

  * Fix incomplete link

-- File Changes --

    M explainer.md (2)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/987.patch
https://github.com/w3c/ServiceWorker/pull/987.diff

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https://github.com/w3c/ServiceWorker/pull/987