Small enhancement to doc generator to account for slices #7732

Job	Run time
lint	6m 22s
test	24m 49s
build	6m 12s
integration-configs-db	3m 0s
integration (requires_docker)	6m 9s
integration (integration_alertmanager)	4m 42s
integration (integration_backward_compatibility)	10m 13s
integration (integration_memberlist)	8m 42s
integration (integration_querier)	16m 3s
integration (integration_ruler)	5m 3s
integration (integration_query_fuzz)	3m 20s
deploy	0s
deploy_website	0s
	1h 34m 35s

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