[css-scroll-snap] Bikeshed fixes

Author: fantasai

css-scroll-snap/Overview.bs

@@ -158,7 +158,7 @@ On the scroll container:
 			<td>High priority
 		<tr>
 			<td>''scroll-snap-destination: <<position>>''
-			<td>''scroll-snap-padding: [ <<length>> | <<percentage> ]{1,4}''
+			<td>''scroll-snap-padding: [ <<length>> | <<percentage>> ]{1,4}''
 			<td>
 		<tr>
 			<td>'scroll-snap-points-x'
@@ -457,7 +457,7 @@ Scroll Snapping Alignment: the 'scroll-snap-align' property {#scroll-snap-align}
 	by using a <a>scroll axis keyword</a>.
 
 	<pre class="prod">
-		<dfn for=scroll-snap-align><<alignment>></dfn> = center | [ start | end ] <percentage>?
+		<dfn for=scroll-snap-align><<alignment>></dfn> = center | [ start | end ] <<percentage>>?
 	</pre>
 
 	Issue: This is a subset of the L4 <<position> syntax