Editorial: remove outdated HTML PR link

fetch.bs

@@ -1113,8 +1113,7 @@ a <a>byte-case-insensitive</a> match for one of
  request object is copied, but will be removed if the request is modified by unprivileged APIs.
 
  <p>`<code>Range</code>` headers are commonly used by <a lt="download the hyperlink">downloads</a>
- and <a lt="resource fetch algorithm">media fetches</a>, although neither of these currently specify
- how. <a href=https://github.com/whatwg/html/pull/2814>html/2914</a> aims to solve this.
+ and <a lt="resource fetch algorithm">media fetches</a>.
 
  <p>A helper is provided to <a for=request>add a range header</a> to a particular request.
 </div>