Fix bikeshed link errors for implementation-defined and url

[dlrobertson]

Summary

There appear to be some link errors that bikeshed throws some warnings for the following, due to multiple definitions:

• url definitions (concept-url from url and navigation-status-url from webdriver)
• implementation defined definitions (implementation-defined from infra and implementation-defined from ecmascript)

Example

 make local
bikeshed spec fetch.bs fetch.html --md-Text-Macro="COMMIT-SHA LOCAL COPY"
LINK ERROR: Multiple possible 'url' dfn refs for '['/']'.
Arbitrarily chose https://url.spec.whatwg.org/#concept-url
To auto-select one of the following refs, insert one of these lines into a <pre class=link-defaults> block:
spec:url; type:dfn; text:url
spec:webdriver-bidi; type:dfn; text:url
<a data-link-for="/" data-link-type="dfn" data-lt="URL">URL</a>
LINK ERROR: Multiple possible 'implementation-defined' dfn refs.
Arbitrarily chose https://infra.spec.whatwg.org/#implementation-defined
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:implementation-defined
spec:ecmascript; type:dfn; text:implementation-defined
<a data-link-type="dfn" data-lt="implementation-defined">implementation-defined</a>
LINK ERROR: Multiple possible 'urls' dfn refs for '['/']'.
Arbitrarily chose https://url.spec.whatwg.org/#concept-url
To auto-select one of the following refs, insert one of these lines into a <pre class=link-defaults> block:
spec:url; type:dfn; text:url
spec:webdriver-bidi; type:dfn; text:url
<a data-link-for="/" data-link-type="dfn" data-lt="URLs">URLs</a>
 ✔  Successfully generated, with 3 linking errors

[whimboo]

The underlying issue with the WebDriver BiDi spec should be fixed now (w3c/webdriver-bidi#347)

[dlrobertson]

The underlying issue with the WebDriver BiDi spec should be fixed now (w3c/webdriver-bidi#347)

Thanks!