Update <meta> description

Update the <meta name="assert" ...> description in table-as-item-specified-width-vertical.html

Author: felipeerias

css/css-flexbox/table-as-item-specified-width-vertical.html

@@ -3,7 +3,7 @@
 <link rel="author" title="Felipe Erias Morandeira" href="mailto:felipeerias@igalia.com" />
 <link rel="help" href="https://www.w3.org/TR/css-flexbox-1/#layout-algorithm" title="9. Flex Layout Algorithm">
 <link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
-<meta name="assert" content="The logical heights of table and flexbox container are orthogonal to each other.">
+<meta name="assert" content="The width of an empty table (vertical direction) inside a flexbox container (row direction) is computed correctly.">
 
 <p>Test passes if there is a filled green square.</p>