[w3c/ServiceWorker] Consider fixing bikeshed warnings (#1596)

I get the following warnings when running Bikeshed locally:

```
WARNING: The following <var>s were only used once in the document:
  'referrerPolicy', in algorithm 'Update'
If these are not typos, please add an ignore='' attribute to the <var>.
LINK ERROR: No 'dfn' refs found for 'application cache'.
<a data-lt="application cache" data-link-type="dfn">HTML5 Application Cache</a>
LINK ERROR: Multiple possible 'event' local refs for 'message'.
Randomly chose one of them; other instances might get a different random choice.
{{message!!event}}
LINK ERROR: Multiple possible 'event' local refs for 'messageerror'.
Randomly chose one of them; other instances might get a different random choice.
{{messageerror!!event}}
LINK ERROR: No 'dfn' refs found for 'replacement enabled'.
[=replacement enabled=]
LINE ~464: No 'dfn' refs found for 'incumbent settings object' that are marked for export.
LINE ~470: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~745: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~796: No 'dfn' refs found for 'dom manipulation task source'.
LINK ERROR: No 'dfn' refs found for 'triggered by user activation'.
<a data-link-type="dfn" data-lt="triggered by user activation">triggered by user activation</a>
LINE ~1262: No 'dfn' refs found for 'surrounding agent' that are marked for export.
LINE ~1270: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~1290: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~1291: No 'dfn' refs found for 'exceptions enabled flag'.
LINE ~1292: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~1297: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~1389: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~1421: No 'dfn' refs found for 'exceptions enabled flag'.
LINE ~1421: No 'dfn' refs found for 'replacement enabled'.
LINE ~1422: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~1427: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~1646: No 'dfn' refs found for 'creating' with for='['ReadableStream']'.
LINK ERROR: No 'dfn' refs found for 'pullalgorithm' with for='['ReadableStream/create']'.
<a data-link-for="ReadableStream/create" data-link-type="dfn" data-lt="pullAlgorithm"><var data-var-ignore="">pullAlgorithm</var></a>
LINK ERROR: No 'dfn' refs found for 'cancelalgorithm' with for='['ReadableStream/create']'.
<a data-link-for="ReadableStream/create" data-link-type="dfn" data-lt="cancelAlgorithm"><var data-var-ignore="">cancelAlgorithm</var></a>
LINK ERROR: No 'dfn' refs found for 'highwatermark' with for='['ReadableStream/create']'.
<a data-link-for="ReadableStream/create" data-link-type="dfn" data-lt="highWaterMark"><var data-var-ignore="">highWaterMark</var></a>
LINK ERROR: No 'dfn' refs found for 'sizealgorithm' with for='['ReadableStream/create']'.
<a data-link-for="ReadableStream/create" data-link-type="dfn" data-lt="sizeAlgorithm"><var data-var-ignore="">sizeAlgorithm</var></a>
LINE ~1924: No 'dfn' refs found for 'internal response' with for='['internal']'.
LINE ~1925: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~1964: No 'dfn' refs found for 'process response' that are marked for export.
LINE ~1974: No 'dfn' refs found for 'process response end-of-body' that are marked for export.
LINE ~1997: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~2020: No 'dfn' refs found for 'disturbed' with for='['Body']'.
LINE ~2020: No 'dfn' refs found for 'locked' with for='['Body']'.
LINE ~2023: No 'dfn' refs found for 'locked' with for='['Body']'.
LINE ~2042: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~2069: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~2100: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~2518: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~2525: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~2541: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~2544: No 'dfn' refs found for 'dom manipulation task source'.
LINK ERROR: No 'dfn' refs found for 'process response' that are marked for export.
<a data-link-type="dfn" data-lt="process response">process response</a>
LINE ~2702: No 'dfn' refs found for 'synchronous flag' that are marked for export.
LINE ~2789: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~2798: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~2855: No 'dfn' refs found for 'dom manipulation task source'.
LINK ERROR: No 'dfn' refs found for 'application cache'.
<a data-link-type="dfn" data-lt="application cache">application cache</a>
LINE ~2871: No 'dfn' refs found for 'dom manipulation task source'.
LINK ERROR: No 'dfn' refs found for 'run csp initialization for a global object' that are marked for export.
<a data-link-type="dfn" data-lt="run CSP initialization for a global object">run CSP initialization for a global object</a>
LINE ~2974: No 'dfn' refs found for 'closing' with for='['WorkerGlobalScope']'.
LINE ~2980: No 'dfn' refs found for 'abort a running script' that are marked for export.
LINE ~3034: No 'dfn' refs found for 'process response' that are marked for export.
LINE ~3080: No 'dfn' refs found for 'source' with for='['Body']'.
LINE ~3322: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~3340: No 'dfn' refs found for 'dom manipulation task source'.
LINK ERROR: No 'dfn' refs found for 'dom manipulation task source'.
<a data-link-type="dfn" data-lt="DOM manipulation task source">DOM manipulation task source</a>
LINE ~3494: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~3496: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~3499: No 'dfn' refs found for 'dom manipulation task source'.
LINE ~3510: No 'dfn' refs found for 'dom manipulation task source'.
WARNING: Unexported dfn that's not referenced locally - did you mean to export it?
<dfn id="dfn-processing-equivalence" data-lt="processing equivalence" data-dfn-type="dfn" data-noexport="by-default">equivalent<a href="#dfn-processing-equivalence" class="self-link"></a></dfn>
```

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