[css-display] Link to the definition of 'white space' we mean. Fixes #1664.

tabatkins · tabatkins · commit ada381e196c8 · 2018-03-19T16:00:36.000-07:00
diff --git a/css-display-3/Overview.bs b/css-display-3/Overview.bs
@@ -812,7 +812,7 @@ Run-In Layout</h2>
 	</ul>
 
 	A <dfn>run-in sequence</dfn> is a maximal sequence of consecutive sibling <a>run-in boxes</a>
-	and intervening white space and/or out-of-flow boxes.
+	and intervening <a>white space</a> and/or out-of-flow boxes.
 
 	Note: This statement implies that out-of-flow boxes are reparented
 	if they are between two run-in boxes.
