[css-text] Fix typo in small-kana listing

follow up on w3c#8442

Author: frivoal

css-text-3/Overview.bs

@@ -8128,7 +8128,7 @@ Small Kana Mappings</h2>
 				-->
 				<tr>
 					<td>&#x1B166; U+1B166
-					<td>&#x30F1; U+30F2
+					<td>&#x30F2; U+30F2
 				<!-- Final N (Katakana) -->
 				<tr>
 					<td>&#x1B167; U+1B167

css-text-4/Overview.bs

@@ -10273,7 +10273,7 @@ Small Kana Mappings</h2>
 				-->
 				<tr>
 					<td>&#x1B166; U+1B166
-					<td>&#x30F1; U+30F2
+					<td>&#x30F2; U+30F2
 				<!-- Final N (Katakana) -->
 				<tr>
 					<td>&#x1B167; U+1B167