Fix port examples in vm and cluster port expose commands to use 30000

[devin-ai-integration]

Fix port examples in CLI help text

Updates the port number in the example help text for 'vm port expose' and 'cluster port expose' commands from 3000 to 30000 to match EC Admin Console behavior.

• Updated vm_port_expose.go example to use port 30000
• Updated cluster_port_expose.go example to use port 30000 for consistency

Link to Devin run: https://app.devin.ai/sessions/4f49043a28a349749ed684ebb6a9b306
Requested by: [email protected]

[devin-ai-integration]

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