gateway.md: remove apiVersion and kind from ListenerSet conf example

[maelvls]

These fields are automatically set by the Helm chart template, so users don't need to specify them manually. Addresses feedback from @ThatsMrTalbot in #2001.

[cert-manager-prow]

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Pull request overview

Updates the Gateway API ListenerSet documentation to avoid requiring Helm users to manually set apiVersion/kind for the controller configuration, since these are templated by the Helm chart.

Changes:

• Remove config.apiVersion and config.kind from the ListenerSet values.yaml example.
• Remove the corresponding --set config.apiVersion=... and --set config.kind=... flags from the Helm install/upgrade example.

Comments suppressed due to low confidence (1)

content/docs/usage/gateway.md:526

• This ListenerSet Helm values example now omits config.apiVersion and config.kind, but the earlier “enable Gateway API support” example in this same doc still includes them. To avoid confusing readers (and to justify why they’re missing here), add a short note near this snippet/command explaining that the Helm chart defaults config.apiVersion/config.kind and they can be omitted, and consider aligning the earlier example to match.

```yaml
# values.yaml
config:
  enableGatewayAPI: true
  enableGatewayAPIListenerSet: true
  featureGates:
    ListenerSets: true

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[maelvls]

ah, already done in #2011 😅 Closing.