Small enhancement to doc generator to account for slices #7731

Job	Run time
build	7m 12s
test	28m 3s
lint	10m 49s
integration (requires_docker)	7m 3s
integration (integration_alertmanager)	4m 51s
integration (integration_backward_compatibility)	10m 35s
integration (integration_memberlist)	8m 55s
integration (integration_querier)	14m 11s
integration (integration_ruler)	4m 39s
integration (integration_query_fuzz)	3m 15s
integration-configs-db	2m 50s
deploy	0s
deploy_website	0s
	1h 42m 23s

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