Does not capitalize bibliographic references

[CxRes]

The bibliographic reference in the text body is not capitalized, but it is in the References section. The two should be handled consistently.

Run this spec:

<pre class=metadata> 
Title: foo
Shortname: foo
Level: 1
Editor: ACME
Abstract: bar
Status: DREAM
</pre>

[[fetch]]

The relevant part of the output:

<main>
   <p><a data-link-type="biblio" href="#biblio-fetch" title="Fetch Standard">[fetch]</a></p>
</main>

<h3 class="no-num no-ref heading settled" id="informative"><span class="content">Informative References</span></h3>
<dl>
   <dt id="biblio-fetch">[FETCH]
   </dt><dd>Anne van Kesteren. <a href="https://fetch.spec.whatwg.org/"><cite>Fetch Standard</cite></a>. Living Standard. URL: <a href="https://fetch.spec.whatwg.org/">https://fetch.spec.whatwg.org/</a>
  </dd></dl>