[css-text] Fix markup

Follow-up on the fix for w3c#5973

Author: frivoal

css-text-3/Overview.bs

@@ -4225,8 +4225,8 @@ Hyphenation: the 'hyphens' property</h3>
 			<tr lang=en>
 				<th>English
 				<td>Unbroken
-				<th>Un&#x2010;
-				<th>broken
+				<td>Un&#x2010;
+				<td>broken
 			<tr lang=nl>
 				<th lang=en>Dutch
 				<td>cafeetje

css-text-4/Overview.bs

@@ -5162,8 +5162,8 @@ Hyphenation Control: the 'hyphens' property</h4>
 			<tr lang=en>
 				<th>English
 				<td>Unbroken
-				<th>Un&#x2010;
-				<th>broken
+				<td>Un&#x2010;
+				<td>broken
 			<tr lang=nl>
 				<th lang=en>Dutch
 				<td>cafeetje