Fix for= typo

Author: dizhang168

dom.bs

@@ -8303,15 +8303,15 @@ steps:
      <a for="composed live range">cached live range</a> of a
      <a>composed live range</a> <var>composed live range</var>,
      set <var>composed live range</var>’s
-     <a or="range">end</a> to <var>bp</var>.
+     <a for="range">end</a> to <var>bp</var>.
 
      <li>Set <var>range</var>'s
      <a for=range>start</a> to <var>bp</var>.
      If <var>range</var> is the
      <a for="composed live range">cached live range</a> of a
      <a>composed live range</a> <var>composed live range</var>,
      set <var>composed live range</var>’s
-     <a or="range">start</a> to <var>bp</var>.
+     <a for="range">start</a> to <var>bp</var>.
     </ol>
    <dt>If these steps were invoked as "set the end"
    <dd>
@@ -8330,7 +8330,7 @@ steps:
      <a for="composed live range">cached live range</a> of a
      <a>composed live range</a> <var>composed live range</var>,
      set <var>composed live range</var>’s
-     <a or="range">start</a> to <var>bp</var>.
+     <a for="range">start</a> to <var>bp</var>.
 
      <li>Set <var>range</var>'s
      <a for=range>end</a> to <var>bp</var>.