[css-text-4] add inline issue about "avoid-orphan" naming

Author: frivoal

css-text-4/Overview.bs

@@ -5512,6 +5512,8 @@ Selecting How to Wrap: the 'text-wrap-style' property</h3>
 	Animation type: discrete
 	</pre>
 
+	Issue: The CSSWG is looking for a better name for ''avoid-orphans''.
+
 	<wpt>
 		parsing/text-wrap-style-computed.html
 		parsing/text-wrap-style-invalid.html