[css-flexbox] Fix main/cross mixup. #792

Author: fantasai

css-flexbox/Overview.bs

@@ -2206,7 +2206,7 @@ Flex Container Baselines</h3>
 				then one is first <a lt="synthesized baseline">synthesized</a>
 				from its border edges.)
 
-			2. Otherwise, the flex container has no first/last main-axis <a>baseline set</a>,
+			2. Otherwise, the flex container has no first/last cross-axis <a>baseline set</a>,
 				and one is <a lt="synthesize baselines">synthesized</a> if needed
 				according to the rules of its <a>alignment context</a>.
 
@@ -3388,15 +3388,20 @@ Substantive Changes and Bugfixes</h4>
 			See <a href="change-2015-align-self-auto">related previous change</a>
 			requiring this computation for absolutely-positioned elements.
 			(<a href="https://github.com/w3c/csswg-drafts/issues/440">Issue 440</a>)
+		<li id="change-2016-baseline-alignment">
+			Change <a>flex items</a> in orthogonal flows and <a>flex items<a> without a baseline
+			to both synthesize their alignment baseline from the <a>flex item</a>’s border box.
+		<li id="change-2016-main-cross-baseline">
+			Fix main/cross error in definition of <a>cross-axis baseline set</a>.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/792">Issue 792</a>)
+			<blockquote>
+				<p>Otherwise, the flex container has no first/last <del>main</del><ins>cross</ins>-axis baseline set&hellip;
+			</blockquote>
 	</ul>
 
-<h4 id="change-201603-substantive">
-Substantive Changes and Bugfixes</h4>
-
+<h4 id="change-201605-clarify">
+Clarifications</h4>
 	<ul>
-		<li id="change-2016-baseline-alignment">
-		Change <a>flex items</a> in orthogonal flows and <a>flex items<a> without a baseline
-		to both synthesize their alignment baseline from the <a>flex item</a>’s border box.
 	</ul>
 
 <h3 id="changes-20160301">