[css-syntax] Remove lingering (now incorrect) guidance about how to serialize delim tokens that look like the Selectors attr ops. Also kill the ? column in the table, which did nothing.

Author: tabatkins

css-syntax/Overview.bs

@@ -3270,7 +3270,7 @@ Serialization</h2>
 
 			<li>
 				For any consecutive pair of tokens,
-				if the first token shows up in the row headings of either of the following two tables,
+				if the first token shows up in the row headings of the following table,
 				and the second token shows up in the column headings,
 				and there's a ✗ in the cell denoted by the intersection of the chosen row and column,
 				the pair of tokens must be serialized with a comment between them.
@@ -3302,10 +3302,10 @@ Serialization</h2>
 				<th>dimension
 				<th>CDC
 				<th>(
-				<th>?
+				<th>*
 			<tr>
 				<th>ident
-				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗ <td>
+				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>
 			<tr>
 				<th>at-keyword
 				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td>
@@ -3333,30 +3333,9 @@ Serialization</h2>
 			<tr>
 				<th>+
 				<td> <td> <td> <td> <td> <td>✗<td>✗<td>✗<td> <td> <td>
-		</table>
-
-		<table class='data'>
-			<tr>
-				<td>
-				<th>=<th>|<th>*
-			<tr>
-				<th>$
-				<td>✗<td> <td>
-			<tr>
-				<th>*
-				<td>✗<td> <td>
-			<tr>
-				<th>^
-				<td>✗<td> <td>
-			<tr>
-				<th>~
-				<td>✗<td> <td>
-			<tr>
-				<th>|
-				<td>✗<td>✗<td>
 			<tr>
 				<th>/
-				<td> <td> <td>✗
+				<td> <td> <td> <td> <td> <td> <td> <td> <td> <td> <td>✗
 		</table>
 	</div>