[css-display] typo

Author: tabatkins

css-display-3/Overview.bs

@@ -598,7 +598,7 @@ Automatic Box Type Transformations</h3>
 	or <dfn export lt="inlinify|inlinification">inlinification</dfn> of the box type,
 	which sets the box’s <a>outer display type</a>
 	to ''block'' or ''inline'' (respectively).
-	(This has no effects on <a>display types</a> that generate no box at all,
+	(This has no effect on <a>display types</a> that generate no box at all,
 	such as ''display/none'' or ''display/contents''.)
 	Additionally: