[css-overflow-3] Editorial improvements to max-lines

Author: frivoal

css-overflow-3/Overview.bs

@@ -498,9 +498,16 @@ Limiting Visible Lines: the 'max-lines' property</h2>
 			in a two-region section,
 			where the first region is for styling the first N lines of the article
 			differently from the rest. -->
+
 	</ul>
 
-	Only positive integers are accepted. Zero or negative integers are invalid.
+	Only positive integers are accepted.
+	Zero or negative integers are invalid
+	and must cause the declaration to be <a>ignored</a>.
+
+	Note: The 'widows', 'orphans', and 'break-inside' properties
+	do not affect the position of the forced <a>region break</a>
+	introduced by the 'max-lines' property.
 
 <h2 id="static-media">
 Overflow in static media</h2>