Description of problem: Describing load balancing using HAProxy for API VIP and Ingress VIP is missing in the BM IPI and the vSphere IPI, and it seems those IPI installations only provide failover capability but not load-balancing.

Version-Release number of selected component (if applicable): 4.10+ 

How reproducible: Always since it's a doc issue.

Steps to Reproduce:

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Actual results: The installation section covers how to set up VIP for the API server and Ingress but missing describing HA using HAProxy.

Expected results: The doc should include load-balancing for the API server and Ingress according to the upstream design guide.

Additional info: