Add more context on what do we expect for users in Step 1: Prerequisites and precheck

[Ishiihara]

File: /production-deployment-using-tiup.md

It would be great if we can provide instructions on what users are expected to in the precheck

• For a testing deployment, what prechecks do users need to perform?
• For a production deployment, what prechecks do users need to perform?

[lonng]

/assign @lonng

[github-actions]

This issue is stale because it has been open for 60 days with no activity. If no comment has been made and the lifecycle/stale label is not removed, this issue will be closed in 15 days.

[lonng]

/assign @lucklove

[lonng]

/unassign lonng

[TomShawn]

@lucklove PTAL

[lucklove]

@King-Dylan We can add the tiup cluster check into the deployment document after pingcap/docs-cn#4868