Editorial: add 103 to note about null body response

Author: LiviaMedeiros

fetch.bs

@@ -7574,8 +7574,8 @@ these steps:
     <p>If <var>response</var>'s <a for=response>status</a> is a <a>null body status</a>, then
     <a>throw</a> a {{TypeError}}.
 
-    <p class="note no-backref">101 is included in <a>null body status</a> due to its use elsewhere.
-    It does not affect this step.
+    <p class="note no-backref">101 and 103 are included in <a>null body status</a> due to their
+    use elsewhere. They do not affect this step.
 
    <li><p>Set <var>response</var>'s <a for=response>body</a> to <var>body</var>'s
    <a for="body with type">body</a>.