Update Linux compatibility list in FAQ

[noahtalerman]

When we ship this story, I think we can update our Linux support.

IIRC vuln support was the only reason we removed the "+" in this PR: #39026

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[noahtalerman]

FYI @AndreyKizimenko please let us know if you don't think we're ready. Up to you.

[AndreyKizimenko]

@noahtalerman we are seeing issues with Vuln processing right now and we might be pushing back the full support to 4.86, it's an ongoing dicussion: https://fleetdm.slack.com/archives/C019WG4GH0A/p1777470875717289

[noahtalerman]

we are seeing issues with Vuln processing right now and we might be pushing back the full support to 4.86, it's an ongoing dicussion: https://fleetdm.slack.com/archives/C019WG4GH0A/p1777470875717289

@AndreyKizimenko sounds good! Up to you. Please feel free to open a follow up PR to edit this compatibility chart.