[css-text-4] Test coverage update

Author: frivoal

css-text-4/Overview.bs

@@ -10739,6 +10739,10 @@ Text Spacing Character Classes</h4>
 				<li>is categorized as East Asian Fullwidth (F) by [[!UAX11]].
 				<li>is upright in vertical text flow using the 'text-orientation' property
 					or the 'text-combine-upright' property.
+
+					<wpt>
+						text-autospace/text-autospace-vertical-upright-001.html
+					</wpt>
 			</ul>
 
 		<dt><dfn>non-ideographic numerals</dfn>