Update live.md - fordwarded port is a security risk

[pixeldoc2000]

Add Warning to port forwarding about potential security risk.

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• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature
• Breaking change (fix/feature causing existing functionality to break)
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• Documentation Update

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[NickM-27]

I don't think this is very helpful without context. Forwarding 8555 is not a risk as nothing is directly exposed on that port and when it is used it is outputting encrypted video and audio data