update example

Author: rachelandrew

css-display-4/Overview.bs

@@ -1210,6 +1210,7 @@ ISSUE(9923): A proposed alternative syntax.
 		In this example, there are three flex items displayed as a row,
 		The 'reading-order-items' property has a value of 'flex-visual'.
 		The 'flex-direction' property is 'row-reverse'.
+		We are in English with a text direction of left to right.
 		The reading order of these items is therefore
 		"Item 3", "Item 2", "Item 1", reading from left to right.