Add docs for accept multiple ha pairs (#6364) #10546

Job	Run time
CodeQL	6m 51s
lint	4m 15s
test	15m 38s
build	3m 59s
integration-configs-db	3m 2s
integration (requires_docker)	7m 0s
integration (integration_alertmanager)	4m 5s
integration (integration_backward_compatibility)	10m 23s
integration (integration_memberlist)	7m 57s
integration (integration_querier)	14m 59s
integration (integration_ruler)	5m 55s
integration (integration_query_fuzz)	4m 40s
deploy_website	48s
deploy	3m 36s
	1h 33m 8s

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