[css-text-3] Update issue wording

Author: frivoal

css-text-3/Overview.bs

@@ -1093,8 +1093,9 @@ Characters and Letters</h3>
       <p class="feedback issue">Comments on how well this would work in practice would
         be very much appreciated, particularly from people who work with
         Thai and similar scripts.
-        Note that browser implementations do not currently follow these rules
-        (although IE does in some cases transform the break).</p>
+        Note that browser implementations do not currently follow these rules consistently
+        (although IE does in some cases transform the break,
+        and Firefox follows the first two bullet points).</p>
 
     <h4 id="white-space-phase-2">Phase II: Trimming and Positioning</h4>