IPFix field name wrong in reference Kibana dashboard definition file

[antoninbas]

Describe the bug
In https://github.com/vmware-tanzu/antrea/blob/master/build/yamls/elk-flow-collector/kibana.ndjson, the field name shows up as ipfix.destinationServiceName, but according to the documentation (https://github.com/vmware-tanzu/antrea/blob/master/docs/network-flow-visibility.md#ies-from-antrea-ie-registry) & the code, the name should be ipfix.destinationServicePortName. As a result, it seems that the dashboards for Pod-to-Service traffic throughput cannot be created properly (they stay empty).

Versions:
Antrea v0.10.1 and TOT