[css-flexbox] bikeshed improvements

--HG--
extra : rebase_source : f01b65220a5ae6b43eb42239bd955a17d191d56c

Author: tabatkins

css-flexbox/Overview.bs

@@ -1131,14 +1131,9 @@ Flex Line Wrapping: the 'flex-wrap' property</h3>
 <h3 id='flex-flow-property'>
 Flex Direction and Wrap: the 'flex-flow' shorthand</h3>
 
-	<pre class='propdef'>
+	<pre class='propdef shorthand'>
 	Name: flex-flow
 	Value: <'flex-direction'> || <'flex-wrap'>
-	Initial: see individual properties
-	Applies to: <a>flex containers</a>
-	Inherited: see individual properties
-	Computed value: see individual properties
-	Media: visual
 	</pre>
 
 	<p>The 'flex-flow' property is a shorthand for setting the 'flex-direction' and 'flex-wrap' properties,