tiup: extend the firewall docs

[dveeden]

What is changed, added or deleted? (Required)

Besides disabling firewalld we can also change the zone to trusted and/or configure the services and add them to the zone.

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• v8.4 (TiDB 8.4 versions)
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Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[ti-chi-bot]

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[ti-chi-bot]

@dveeden: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-verify	3476fa9	link	true	/test pull-verify

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