[x/blog] go.blog: fix typo in normalization article table

R=rsc
https://golang.org/cl/33630044
X-Blog-Commit: 7ca216336188ae9a7621a34e270d120ee093fea1

blog/content/normalization/table1.html

@@ -14,7 +14,7 @@
 	</tr>
 	<tr>
 		<th>Compatibility equivalence</th>
-		<td>NFK</td>
-		<td>NFK</td>
+		<td>NFKC</td>
+		<td>NFKD</td>
 	</tr>
 </table>