Editorial: define stream variable before using it

pullAlgorithm refers to stream, so we should define stream first.

Author: Ms2ger

fetch.bs

@@ -6243,8 +6243,10 @@ optional boolean <var>forceNewConnection</var> (default false), run these steps:
 
   <p class="note">This represents an internal buffer inside the network layer of the user agent.
 
+ <li><p>Let <var>stream</var> be a <a>new</a> {{ReadableStream}}.
+
  <li>
-  <p>Let |pullAlgorithm| be the followings steps:
+  <p>Let |pullAlgorithm| be the following steps:
 
   <ol>
    <li><p>Let |promise| be [=a new promise=].
@@ -6279,8 +6281,6 @@ optional boolean <var>forceNewConnection</var> (default false), run these steps:
  <var>fetchParams</var>'s <a for="fetch params">controller</a> with <var>reason</var>, given
  <var>reason</var>.
 
- <li><p>Let <var>stream</var> be a <a>new</a> {{ReadableStream}}.
-
  <li><p>[=ReadableStream/set up with byte reading support|Set up=] |stream| with byte reading
  support with <var>[=ReadableStream/set up/pullAlgorithm=]</var> set to |pullAlgorithm|,
  <var>[=ReadableStream/set up/cancelAlgorithm=]</var> set to |cancelAlgorithm|.