Zendure: better template (#17177)

templates/definition/meter/zendure.yaml

@@ -9,7 +9,14 @@ params:
   - name: usage
     choice: ["pv", "battery"]
   - name: account
+    required: true
+    example: dev@zendure.com
   - name: serial
+    required: true
+    example: VU5D99F74021B04
+    help:
+      de: "Zu finden in der Zendure App in den Einstellungen des Geräts"
+      en: "You can find this in the Zendure App in the settings of the device"
   - name: region
     type: choice
     default: EU