[css-display-3] Clarify that blockification/inlinification are computed-value operations. Fixes w3c#6251

Author: fantasai

css-display-3/Overview.bs

@@ -701,7 +701,7 @@ Automatic Box Type Transformations</h3>
 
 	Some layout effects require <dfn export lt="blockify|blockification">blockification</dfn>
 	or <dfn export lt="inlinify|inlinification">inlinification</dfn> of the box type,
-	which sets the box’s <a>outer display type</a>
+	which sets the box’s [=computed value|computed=] <a>outer display type</a>
 	to ''block'' or ''inline'' (respectively).
 	(This has no effect on <a>display types</a> that generate no box at all,
 	such as ''display/none'' or ''display/contents''.)
@@ -1437,6 +1437,15 @@ Changes</h2>
 			Defined that [=replaced elements=] with a [=layout-internal=] 'display'
 			are treated as ''display: inline''.
 			(<a href="https://github.com/w3c/csswg-drafts/issues/6000">Issue 6000</a>)
+		<li id="blockification-computed">
+			Clarified that [=blockification=] and [=inlinification=] are [=computed value=] changes.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/6251">Issue 6251</a>)
+			<blockquote>
+				<p>Some layout effects require <dfn export lt="blockify|blockification">blockification</dfn>
+				or <dfn export lt="inlinify|inlinification">inlinification</dfn> of the box type,
+				which sets the box’s <ins>[=computed value|computed=]</ins> <a>outer display type</a>
+				to ''block'' or ''inline'' (respectively).
+			</blockquote>
 		<li id="change-block-layout-def">
 			Added definition for [=block layout=] to glossary, for convenience.
 		<li id="change-grid-refs">