Fix bikeshed errors

[beaufortfrancois]

This PR fixes the following bikeshed errors:

LINK ERROR: Multiple possible 'user agent' dfn refs.
Arbitrarily chose https://infra.spec.whatwg.org/#user-agent
To auto-select one of the following refs, insert one of these lines into a <pre class=link-defaults> block:
spec:infra; type:dfn; text:user agent
spec:reporting-1; type:dfn; text:user agent
The following refs show up multiple times in their spec, in a way that Bikeshed can't distinguish between. Either create a manual link, or ask the spec maintainer to add disambiguating attributes (usually a for='' attribute to all of them).
spec:css2; type:dfn; for:/; text:user agent
  https://www.w3.org/TR/CSS21/conform.html#ua
  https://www.w3.org/TR/CSS21/conform.html#user-agent
<a bs-line-number="173" data-link-type="dfn" data-lt="user agent">user agent</a>
LINK ERROR: Multiple possible 'origins' dfn refs.
Arbitrarily chose https://dom.spec.whatwg.org/#concept-document-origin
To auto-select one of the following refs, insert one of these lines into a <pre class=link-defaults> block:
spec:dom; type:dfn; text:origin
spec:fetch; type:dfn; text:origin
spec:html; type:dfn; for:/; text:origin
spec:html; type:dfn; for:environment settings object; text:origin
spec:url; type:dfn; text:origin
spec:service-workers; type:dfn; text:origin
spec:fenced-frame; type:dfn; for:exfiltration budget metadata; text:origin
spec:fenced-frame; type:dfn; for:exfiltration budget metadata reference; text:origin
spec:prefetch; type:dfn; text:origin
<a bs-line-number="176" data-link-type="dfn" data-lt="origins">origins</a>
LINK ERROR: Multiple possible 'user agent' dfn refs.
Arbitrarily chose https://infra.spec.whatwg.org/#user-agent
To auto-select one of the following refs, insert one of these lines into a <pre class=link-defaults> block:
spec:infra; type:dfn; text:user agent
spec:reporting-1; type:dfn; text:user agent
The following refs show up multiple times in their spec, in a way that Bikeshed can't distinguish between. Either create a manual link, or ask the spec maintainer to add disambiguating attributes (usually a for='' attribute to all of them).
spec:css2; type:dfn; for:/; text:user agent
  https://www.w3.org/TR/CSS21/conform.html#ua
  https://www.w3.org/TR/CSS21/conform.html#user-agent
<a bs-line-number="178" data-link-type="dfn" data-lt="user agent">user agent</a>
LINK ERROR: Multiple possible 'origin' dfn refs.
Arbitrarily chose https://dom.spec.whatwg.org/#concept-document-origin
To auto-select one of the following refs, insert one of these lines into a <pre class=link-defaults> block:
spec:dom; type:dfn; text:origin
spec:fetch; type:dfn; text:origin
spec:html; type:dfn; for:/; text:origin
spec:html; type:dfn; for:environment settings object; text:origin
spec:url; type:dfn; text:origin
spec:service-workers; type:dfn; text:origin
spec:fenced-frame; type:dfn; for:exfiltration budget metadata; text:origin
spec:fenced-frame; type:dfn; for:exfiltration budget metadata reference; text:origin
spec:prefetch; type:dfn; text:origin
<a bs-line-number="208" data-link-type="dfn" data-lt="origin">origin</a>
LINK ERROR: Multiple possible 'item' dfn refs.
Arbitrarily chose https://infra.spec.whatwg.org/#list-item
To auto-select one of the following refs, insert one of these lines into a <pre class=link-defaults> block:
spec:infra; type:dfn; for:list; text:item
spec:infra; type:dfn; for:stack; text:item
spec:infra; type:dfn; for:queue; text:item
spec:infra; type:dfn; for:set; text:item
spec:infra; type:dfn; for:struct; text:item
spec:infra; type:dfn; for:tuple; text:item
<a bs-line-number="251" data-link-type="dfn" data-lt="item">item</a>
LINK ERROR: Multiple possible 'origin' dfn refs.
Arbitrarily chose https://dom.spec.whatwg.org/#concept-document-origin
To auto-select one of the following refs, insert one of these lines into a <pre class=link-defaults> block:
spec:dom; type:dfn; text:origin
spec:fetch; type:dfn; text:origin
spec:html; type:dfn; for:/; text:origin
spec:html; type:dfn; for:environment settings object; text:origin
spec:url; type:dfn; text:origin
spec:service-workers; type:dfn; text:origin
spec:fenced-frame; type:dfn; for:exfiltration budget metadata; text:origin
spec:fenced-frame; type:dfn; for:exfiltration budget metadata reference; text:origin
spec:prefetch; type:dfn; text:origin
<a bs-line-number="251" data-link-type="dfn" data-lt="origin">origin</a>
LINK ERROR: No 'dfn' refs found for 'context object' that are marked for export.
<a bs-line-number="367" data-link-type="dfn" data-lt="context object">context object</a>
LINK ERROR: No 'dfn' refs found for 'context object' that are marked for export.
<a bs-line-number="393" data-link-type="dfn" data-lt="context object">context object</a>
LINK ERROR: No 'dfn' refs found for 'context object' that are marked for export.
<a bs-line-number="396" data-link-type="dfn" data-lt="context object">context object</a>
LINK ERROR: No 'dfn' refs found for 'context object' that are marked for export.
<a bs-line-number="397" data-link-type="dfn" data-lt="context object">context object</a>
Unexported dfn that's not referenced locally - did you mean to export it?
<dfn bs-line-number="181" data-dfn-type="dfn" id="active-picture-in-picture-session" data-lt="active Picture-in-Picture session" data-noexport="by-default" class="dfn-paneled">active Picture-in-Picture session</dfn>

FIX #234

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