[css-text-3] Fix typo

Author: fantasai

css-text-3/Overview.bs

@@ -6726,7 +6726,7 @@ Changes</h2>
   A handful of the more significant changes are highlighted below:
 
   <ul>
-    <li>Switched 'tab-size' to use <<number>> instead of <<integer> so that it is animatable,
+    <li>Switched 'tab-size' to use <<number>> instead of <<integer>> so that it is animatable,
         and defined it to also account for 'letter-spacing' and 'word-spacing'.
     <li>Made 'text-align' a shorthand of 'text-align-last' and the new 'text-align-all' property.
     <li>Removed dependence of 'text-align-last' on ''text-align: justify'',