Add ordered list to indent an algorithm

Author: quasi-mod

fetch.bs

@@ -5259,6 +5259,7 @@ these steps:
    <li>
 
     <p>If <var>fetchResponse</var> is non-null, then:
+     <ol>
      <li><p>If<var>fetchResponse</var> is <a for=/>response</a>, then:
       <ol>
        <li><p>Set <var>response</var> to <var>fetchResponse</var>.
@@ -5303,6 +5304,7 @@ these steps:
        <a for="fetch timing info">service worker timing info</a> to
        <var>fetchResponse</var>.
       </ol>
+    </ol>
    </ol>
 
  <li>