Add docs for open telemetry collector #10731

Job	Run time
test-no-race	7m 11s
lint	4m 21s
CodeQL	7m 9s
test	15m 45s
build	4m 11s
integration-configs-db	2m 50s
integration (requires_docker)	7m 30s
integration (integration_alertmanager)	4m 16s
integration (integration_backward_compatibility)	10m 26s
integration (integration_memberlist)	7m 40s
integration (integration_querier)	15m 11s
integration (integration_ruler)	5m 32s
integration (integration_query_fuzz)	5m 5s
deploy_website	0s
deploy	0s
	1h 37m 7s

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