Provide some reasonable configuration values for system resources.

### Where is the problem?

https://docs.konghq.com/gateway/2.6.x/install-and-run/macos/#prerequisites

### What happened?

There are no system resource requirements for example `ulimit -n` >= 4096, not sure about other resources.

### What did you expect to happen?

This section should have had some system/platform related resource requirements.

### Code of Conduct and Community Expectations

- [X] I agree to follow this project's Code of Conduct
- [X] I agree to abide by the Community Expectations

Review the macOS prerequisites section at the linked Kong Gateway documentation page and identify the system and platform resource requirements it should state, including the ulimit example. Done means the section documents reasonable, verified requirements and the page clearly covers the requested system resources.

Written by the indexing model from the issue text.