Editorial: update argument for collect an HTTP quoted string

Rename the "extract-value flag" argument of the algorithm "collect an HTTP quoted string" to a boolean "extract-value" that will by default be false.

Downstream updates: whatwg/mimesniff#170.

Fixes #1567.

Author: dlrobertson

fetch.bs

@@ -446,7 +446,7 @@ preferred. Unlike <a>ASCII whitespace</a> this excludes U+000C FF.
 <p>To
 <dfn export lt="collect an HTTP quoted string|collecting an HTTP quoted string">collect an HTTP quoted string</dfn>
 from a <a for=/>string</a> <var>input</var>, given a <a>position variable</a> <var>position</var>
-and optionally an <var>extract-value flag</var>, run these steps:
+and an optional boolean <var>extract-value</var> (default false):
 
 <ol>
  <li><p>Let <var>positionStart</var> be <var>position</var>.
@@ -495,7 +495,7 @@ and optionally an <var>extract-value flag</var>, run these steps:
     </ol>
   </ol>
 
- <li><p>If the <var>extract-value flag</var> is set, then return <var>value</var>.
+ <li><p>If <var>extract-value</var> is true, then return <var>value</var>.
 
  <li><p>Return the <a for=/>code points</a> from <var>positionStart</var> to <var>position</var>,
  inclusive, within <var>input</var>.
@@ -506,7 +506,7 @@ and optionally an <var>extract-value flag</var>, run these steps:
   <tr>
    <th>Input
    <th>Output
-   <th>Output with the <var>extract-value flag</var> set
+   <th>Output with <var>extract-value</var> set to true
    <th>Final <a>position variable</a> value
   <tr>
    <td>"<code><mark>"\</mark></code>"