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Issue description: feedback from kniederw@redhat.com   :

 In do480-2.4/pages/ch09s05 we have the following sentence: "For example, defining requests and limits for CPU and memory is a best practice, but nothing prevents you from creating a deployment without such limits."

While CPU requests, memory limits and requests are surely a good idea, we should not propose CPU limits as best practice. CPU limits are a controversial topic and cause a lot of confusion for customers.

I (as a TAM) would advise to rephrase this part and exclude CPU limits. AFAIK the official Red Hat strategy is not to propose CPU limits as best practices, but leave this as a choice for customers. We usually elaborate on the pros/cons of having CPU limits, but do not advise it as best practice. Explanation about the controversy can be found here:  https://home.robusta.dev/blog/stop-using-cpu-limits

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