Update Overview.bs

Co-authored-by: fantasai <fantasai.bugs@inkedblade.net>

Author: arichiv

css-pseudo-4/Overview.bs

@@ -1389,8 +1389,8 @@ Security Considerations for Highlighting</h3>
   UAs that implement ''::spelling-error'' and ''::grammar-error''
   must mitigate the following attacks:
   <ul>
-    <li>Pages attempting to directly read the styling of highlighted segments.</li>
-    <li>Pages attempting to track performance impacts of styling highlighted segments via programatic modification of text fields.</li>
+    <li>Pages attempting to directly read the styling of highlighted segments.
+    <li>Pages attempting to track performance impacts of styling highlighted segments via programatic modification of text fields.
   </ul>
 
 <h2 id="treelike">