Update configure-high-availability.md

[TheNerd02]

The documentation mentions 2 physical server, implying the configuration can only be applied when hardware servers are being used not virtual machines. However below that There are some caveats about using cloud platforms (implying it would be possible to apply this configuration to the cloud as well) "Some cloud platforms don’t allow direct IP management with keepalived. If you’re using a cloud environment, check whether it supports VIP assignment."

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2 out of 3 committers have signed the CLA.
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✅ (JTorreG)[https://github.com/JTorreG]
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[ADubhlaoich]

LGTM: in newer documentation we typically refer to this kind of use case as "Virtual environment or bare metal".

@TheNerd02 you'll need to sign the CLA with a comment before this PR is eligible for merge.

[JTorreG]

I am merging this PR, @TheNerd02 , if you want to contribute again in the future, please accept the CLA