[css-flexbox-1] Minimal changes to stop defining 'auto' keyword's existence here; propdefs are now in css-sizing. w3c#1920

Author: fantasai

css-flexbox-1/Overview.bs

@@ -904,24 +904,17 @@ Automatic Minimum Size of Flex Items</h3>
 	this specification introduces a new ''min-width/auto'' value
 	as the initial value of the 'min-width' and 'min-height' properties defined in CSS 2.1. [[!CSS21]]
 
-	<pre class="propdef partial">
-	Name: min-width, min-height
-	New values: auto
-	New initial value: auto
-	New computed value: the percentage as specified or the absolute length or a keyword
-	</pre>
-
-	<dl dfn-type=value dfn-for="min-width, min-height">
-		<dt><dfn>auto</dfn>
+	<dl>
+		<dt>''min-width/height: auto''
 		<dd>
 			On a <a>flex item</a> whose 'overflow' is ''overflow/visible'' in the <a>main axis</a>,
 			when specified on the <a>flex item's</a> main-axis min-size property,
 			specifies an <a>automatic minimum size</a>.
-			It otherwise computes to ''0''
+			Otherwise computes to ''0''
 			(unless otherwise defined by a future specification).
 	</dl>
 
-	In general, the <dfn dfn export>automatic minimum size</dfn> of a <a>flex item</a>
+	In general, the <a>automatic minimum size</a> of a <a>flex item</a>
 	is the smaller of its <a>content size</a> and its <a>specified size</a>.
 	However, if the box has an aspect ratio and no <a>specified size</a>,
 	its <a>automatic minimum size</a>