NGF: Document patching dataplane Service, Deployment, DaemonSet

[ciarams87]

Proposed changes

Problem: NGF is adding a way to submit custom patches to unblock users who need to set fields that are not yet exposed in the NginxProxy CRD. This needs to be documented for users.

Solution: Extend the data plane configuration document to cover this functionality.

Partially addresses nginx/nginx-gateway-fabric#3568

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[bjee19]

Nice!

[ADubhlaoich]

LGTM: please ensure the merge commit for this PR adheres to Conventional Commits, per our Commit messages conventions.