Create guide doc for partition compaction #11168

Job	Run time
CodeQL	7m 1s
test	16m 10s
lint	4m 24s
build	4m 12s
test-no-race	7m 25s
integration-configs-db	3m 6s
integration (requires_docker)	7m 0s
integration (integration_alertmanager)	4m 21s
integration (integration_backward_compatibility)	10m 9s
integration (integration_memberlist)	8m 19s
integration (integration_querier)	15m 19s
integration (integration_ruler)	5m 58s
integration (integration_query_fuzz)	5m 26s
deploy_website	0s
deploy	0s
	1h 38m 50s

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