docs: correct return type for findAppInDirectories #7222

Job	Run time
changes	6s
integration-sqlite (capabilities_features, 8.2, main)	4m 27s
integration-sqlite (collaboration_features, 8.2, main)	6m 6s
integration-sqlite (comments_features, 8.2, main)	5m 53s
integration-sqlite (dav_features, 8.2, main)	9m 17s
integration-sqlite (features, 8.2, main)	8m 13s
integration-sqlite (federation_features, 8.2, main)	5m 3s
integration-sqlite (--tags ~@large files_features, 8.2, main)	12m 43s
integration-sqlite (filesdrop_features, 8.2, main)	4m 22s
integration-sqlite (openldap_features, 8.2, main)	3m 47s
integration-sqlite (openldap_numerical_features, 8.2, main)	3m 41s
integration-sqlite (ldap_features, 8.2, main)	3m 52s
integration-sqlite (remoteapi_features, 8.2, main)	3m 28s
integration-sqlite (setup_features, 8.2, main)	4m 21s
integration-sqlite (sharees_features, 8.2, main)	6m 29s
integration-sqlite (sharing_features, 8.2, main)	14m 3s
integration-sqlite (videoverification_features, 8.2, main)	7m 37s
integration-sqlite-summary	4s
	1h 43m 32s

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