Small enhancement to doc generator to account for slices #7733

Job	Run time
build	7m 50s
lint	7m 37s
test	21m 14s
integration-configs-db	3m 46s
integration (requires_docker)	7m 5s
integration (integration_alertmanager)	5m 0s
integration (integration_backward_compatibility)	10m 10s
integration (integration_memberlist)	8m 15s
integration (integration_querier)	15m 31s
integration (integration_ruler)	5m 51s
integration (integration_query_fuzz)	2m 45s
deploy_website	0s
deploy	0s
	1h 35m 4s

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