[css-flexbox] Add link to multicol

Author: fantasai

css-flexbox/Overview.bs

@@ -501,7 +501,7 @@ Flex Containers: the ''flex'' and ''inline-flex'' 'display' values</h2>
 	and so some properties that were designed with the assumption of block layout don't apply in the context of flex layout.
 	In particular:
 
-		* all of the 'column-*' properties in the Multicol module have no effect on a flex container.
+		* the 'column-*' properties in the Multi-column Layout module [[!CSS3COL]] have no effect on a flex container.
 		* 'float' and 'clear' have no effect on a <a>flex item</a>,
 			and do not take it out-of-flow.
 			However, the 'float' property can still affect box generation
@@ -3752,15 +3752,16 @@ Clarifications</h4>
 			Clarified that table anonymous box generation occurs
 			in place of computed value conversion for internal table elements.
 		<li id="clarify-2012-display-blockification">
-			Clarified interaction of flex item determination with 'display-inside' / 'display-outside'
+			Clarified interaction of flex item determination with <css>display-inside</css> / <css>display-outside</css>
 			(the new longhands of 'display' defined in the <a href="http://www.w3.org/TR/css-display/">CSS Display Module Level 3</a>).
 			<blockquote>
-				<ins><p>If the specified 'display-outside' of an in-flow child of an element that generates a <a>flex container</a>
+				<ins><p>If the specified <css>display-outside</css> of an in-flow child of an element that generates a <a>flex container</a>
 					is ''inline-level'',
 					it computes to ''block-level''.
 					(This effectively converts any inline 'display' values to their block equivalents.)</p>
 				</ins>
 			</blockquote>
+			Note: This change was <a href="#change-201409-display-longhands">reverted</a>.
 		<li id="clarify-2012-overflow-flex-containers">
 			Clarified that 'overflow' applies to flex containers.
 		<li id="clarify-2012-first-line-letter">