Editorial: initialize a response does not have an optional argument

fetch.bs

@@ -8192,8 +8192,7 @@ enum ResponseType { "basic", "cors", "default", "error", "opaque", "opaqueredire
 
 <div algorithm>
 <p>To <dfn>initialize a response</dfn>, given a {{Response}} object <var>response</var>,
-{{ResponseInit}} <var>init</var>, and an optional <a for=/>body with type</a> <var>body</var>, run
-these steps:
+{{ResponseInit}} <var>init</var>, and null or a <a for=/>body with type</a> <var>body</var>:
 
 <ol>
  <li><p>If <var>init</var>["{{ResponseInit/status}}"] is not in the range 200 to 599, inclusive,
@@ -8213,7 +8212,7 @@ these steps:
  <var>init</var>["{{ResponseInit/headers}}"].
 
  <li>
-  <p>If <var>body</var> was given, then:
+  <p>If <var>body</var> is non-null, then:
 
   <ol>
    <li>