Editorial: update parse a MIME type

Update the usage of "collect an HTTP quoted string" in the "parse a MIME type" algorithm as per whatwg/fetch#1567.

Author: dlrobertson

mimesniff.bs

@@ -325,7 +325,7 @@ a <a>valid MIME type string</a> that does not contain U+003B (;).
 
     <ol>
      <li><p>Set <var>parameterValue</var> to the result of <a>collecting an HTTP quoted string</a>
-     from <var>input</var>, given <var>position</var> and the <var ignore>extract-value flag</var>.
+     from <var>input</var>, given <var>position</var> and true.
 
      <li>
       <p><a>Collect a sequence of code points</a> that are not U+003B (;) from <var>input</var>,