DOCS-3844: Add system log forwarding configuration

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Automated documentation updates from Promptless. Source: https://viaminc.slack.com/archives/D08RX76JM71/p1747236721875399

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[viambot]

👋 Thanks for contributing! A reviewer will look at it on the next working day!

[npentrel]

Suggested change

	{{< alert title="Note" color="note" >}}
	System log forwarding requires journald to be available on the system. This feature is only supported on Linux systems.
	{{< /alert >}}

[promptless]

I've added the requested changes in commit 46aa092

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✅ npentrel
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[npentrel]

Hi @Otterverse, would you mind checking this? This is our first PR that is AI generated, but I have reviewed it, so just be aware. Thanks!

[Otterverse]

Just one line I think could be clearer, otherwise good.

[Otterverse]

Would reword this exception to say something like "note: viam-agent and viam-server logs are sent directly to the cloud (and always visible), so cannot be added or removed here"

[promptless]

I've added the requested changes in commit 16a3289

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