NGF: Update data plane configuration doc

[salonichf5]

Proposed changes

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Data plane configuration doc needs to be updated to reflect new changes in NginxProxy resource

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Closes #ISSUE

nginx/nginx-gateway-fabric#3238

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[ADubhlaoich]

LGTM!

[ADubhlaoich]

Still LGTM, but noticed some stuff on a second pass.

[sjberman]

Suggested change

	You can configure deployment and service settings for all data plane instances by editing the `NginxProxy` resource at the Gateway or GatewayClass level. These settings can also be specified under the `nginx.` section in the Helm values file. You can edit things such as replicas, pod scheduling options, container resource limits, extra volume mounts, service types and load balancer settings.
	You can configure deployment and service settings for all data plane instances by editing the `NginxProxy` resource at the Gateway or GatewayClass level. These settings can also be specified under the `nginx` section in the Helm values file. You can edit things such as replicas, pod scheduling options, container resource limits, extra volume mounts, service types and load balancer settings.