HDFS-15698. Fix the typo of dfshealth.html after HDFS-15358 (#2495)

(cherry picked from commit 68442b48c8a044b1ead89e22003b6db4d300bfad)

hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/dfshealth.html

@@ -373,7 +373,7 @@
     <td></td>
     <td></td>
     <td></td>
-    <td></td>>
+    <td></td>
   </tr>
   {/DeadNodes}
 </table>