NGF: Scaling control plane and data plane pods

[salonichf5]

Proposed changes

Write a clear and concise description that helps reviewers understand the purpose and impact of your changes. Use the
following format:

Problem: Users need a how to guide on how to scale control plane and data plane

Solution: Introduces a new how-to guide on scaling control and data plane pods

Testing: Describe any testing that you did.

Please focus on (optional): If you any specific areas where you would like reviewers to focus their attention or provide
specific feedback, add them here.

If this PR addresses an issue on GitHub, ensure that you link to it here:

nginx/nginx-gateway-fabric#3235

Closes #ISSUE

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[bjee19]

content looks good to me after single change, i'll defer to @ADubhlaoich to any stylistic docs changes

[ADubhlaoich]

Generally LGTM, sorry about the edit suggestions.

[ADubhlaoich]

Updates LGTM!