[css-break-3] Remove redundant text

Author: frivoal

css-break-3/Overview.bs

@@ -416,10 +416,6 @@ Breaks Between Lines: 'orphans', 'widows'</h3>
   Inherited: yes
   </pre>
 
-  <p>
-    The 'widows' and 'orphans' properties have no effect
-    on <a>block container boxes</a> that contain only <a>block-level</a> boxes.
-  </p>
   <p>
     The 'orphans' property specifies the minimum number
     of line boxes in a block container