Re: [ServiceWorker] Some grammar. (e7ddda2)

Maybe something like:

```HTML
<p>The lifetime of a <a href="#dfn-service-worker">service worker</a> is tied to the execution lifetime of events
**and** not references held by <a href="#dfn-service-worker-client">service worker clients</a> to the
<code><a href="#service-worker-interface">ServiceWorker</a></code> object.</p>

<p>A user agent <em class="rfc2119" title="MAY">may</em> 
<a href="#terminate-service-worker-algorithm">terminate</a> <a href="#dfn-service-worker">service workers</a> 
at any time that: 
<ul>
   <li>it has no events to handle,</li>
   <li>or detects abnormal operation: such an infinite loop, or tasks exceeding user agent imposed time limits (if any) while handling the events.</li>
</ul>
```
It just breaks it up a little bit more. 

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