format markdown code block (#5594)

Signed-off-by: bevisy <binbin36520@gmail.com>

docs/configuration/template_examples.md

@@ -80,7 +80,7 @@ If accessed as `console.html?instance=hostname`, `.Params.instance` will evaluat
     <td>Transmitted</td>
     <td>{{ with printf "rate(node_network_transmit_bytes{job='node',instance='%s',device='%s'}[5m])" .Labels.instance .Labels.device | query }}{{ . | first | value | humanize }}B/s{{end}}</td>
   </tr>{{ end }}
-<table>
+</table>
 ```
 
 Here we iterate over all network devices and display the network traffic for each.