Correct boundary point comparison in set the start or end

Fixes #924.

Author: chansuke

dom.bs

@@ -7803,27 +7803,27 @@ steps:
    <dt>If these steps were invoked as "set the start"
    <dd>
     <ol>
-     <li>If <var>bp</var> is
-     <a for="boundary point">after</a> the
-     <var>range</var>'s <a for=range>end</a>, or
-     if <var>range</var>'s
+     <li>If <var>range</var>'s
      <a for="live range">root</a> is not equal to
-     <var>node</var>'s <a for=tree>root</a>, set
-     <var>range</var>'s <a for=range>end</a> to
-     <var>bp</var>.
+     <var>node</var>'s <a for=tree>root</a>,
+     or if <var>bp</var> is
+     <a for="boundary point">after</a> the
+     <var>range</var>'s <a for=range>end</a>, set
+     <var>range</var>'s <a for=range>end</a>
+     to <var>bp</var>.
 
      <li>Set <var>range</var>'s
      <a for=range>start</a> to <var>bp</var>.
     </ol>
    <dt>If these steps were invoked as "set the end"
    <dd>
     <ol>
-     <li>If <var>bp</var> is
-     <a for="boundary point">before</a> the
-     <var>range</var>'s <a for=range>start</a>,
-     or if <var>range</var>'s
+     <li>If <var>range</var>'s
      <a for="live range">root</a> is not equal to
-     <var>node</var>'s <a for=tree>root</a>, set
+     <var>node</var>'s <a for=tree>root</a>,
+     or if <var>bp</var> is
+     <a for="boundary point">before</a> the
+     <var>range</var>'s <a for=range>start</a>, set
      <var>range</var>'s <a for=range>start</a>
      to <var>bp</var>.
 
@@ -10106,7 +10106,8 @@ Yash Handa,
 Yehuda Katz,
 Yoav Weiss,
 Yoichi Osato,
-Yoshinori Sano, and
+Yoshinori Sano,
+Yusuke Abe, and
 Zack Weinberg
 for being awesome!