[css-syntax-3] Fix serialization matrix related to CDC-token (w3c#6874)

Author: lahmatiy

css-syntax-3/Overview.bs

@@ -3654,16 +3654,16 @@ Serialization</h2>
 				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td> <td>
 			<tr>
 				<th>#
-				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td> <td> <td>
+				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td> <td>
 			<tr>
 				<th>-
-				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td> <td> <td>
+				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td> <td>
 			<tr>
 				<th>number
-				<td>✗<td>✗<td>✗<td>✗<td> <td>✗<td>✗<td>✗<td> <td> <td> <td>✗
+				<td>✗<td>✗<td>✗<td>✗<td> <td>✗<td>✗<td>✗<td>✗<td> <td> <td>✗
 			<tr>
 				<th>@
-				<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td> <td> <td> <td> <td> <td>
+				<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td> <td> <td>✗<td> <td> <td>
 			<tr>
 				<th>.
 				<td> <td> <td> <td> <td> <td>✗<td>✗<td>✗<td> <td> <td> <td>