[css-flexbox] Simplify how we talk about automatic minimum size.

Author: tabatkins

css-flexbox/Overview.bs

@@ -886,36 +886,18 @@ Implied Minimum Size of Flex Items</h3>
 		<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,
-			the following table gives the minimum size:
-
-			<table class=data>
-				<colgroup span=2></colgroup>
-				<colgroup span=1></colgroup>
-				<thead>
-					<tr>
-						<th>Specified Size
-						<th>Transferred Size
-						<th>Minimum Size
-				<tbody>
-					<tr>
-						<td>
-						<td>
-						<td><var>content size</var>
-					<tr>
-						<td>✓
-						<td>
-						<td>min(<var>specified size</var>, <var>content size</var>)
-					<tr>
-						<td>
-						<td>✓
-						<td>min(<var>transferred size</var>, <var>content size</var>)
-					<tr>
-						<td>✓
-						<td>✓
-						<td>min(<var>specified size</var>, <var>content size</var>)
-			</table>
-
-			Where:
+			specifies an <dfn>automatic minimum size</dfn>.
+
+			In general, the <a>automatic minimum size</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>
+			is the smaller of its <a>content size</a> and its <a>transferred size</a>.
+
+			The <a>content size</a>, <a>specified size</a>, and <a>transferred size</a>
+			used in this calculation account for the relevant min/max/preferred size properties
+			so that the <a>automatic minimum size</a> does not interfere with any author-provided constraints,
+			and are defined below:
 
 			<dl>
 				<dt><var>specified size</var>