Add bidi isolation changes to changes section

Author: fantasai

css3-writing-modes/Overview.html

@@ -3421,6 +3421,11 @@ <h3 class=no-num id=recent-changes> Changes from the <a
     class=css>isolate bidi-override</code>’ with single keyword ‘<a
     href="#isolate-override"><code class=css>isolate-override</code></a>’.
 
+   <li>Reworked bidi isolation slightly to better accommodate the possible
+    addition of isolation codes to Unicode bidi: paragraph determination for
+    isolated content is now performed per-paragraph, rather than per-element.
+    
+
    <li>Added data tables for orientation of characters in Unicode.
 
    <li>Replaced <i>before</i> with <a href="#head"><i>head</i></a> and

css3-writing-modes/Overview.src.html

@@ -2538,6 +2538,8 @@ <h3 class="no-num" id="recent-changes">
   <p>Major changes include:</p>
   <ul>
     <li>Replaced 'unicode-bidi' value of ''isolate bidi-override'' with single keyword ''isolate-override''.
+    <li>Reworked bidi isolation slightly to better accommodate the possible addition of isolation codes to Unicode bidi:
+      paragraph determination for isolated content is now performed per-paragraph, rather than per-element.
     <li>Added data tables for orientation of characters in Unicode.
     <li>Replaced <i>before</i> with <i>head</i> and <i>after</i> with <i>foot</i>.
   </ul>