update index

Author: riswinto

learn-pr/wwl-sci/purview-implement-manage-retention/index.yml

@@ -39,9 +39,6 @@ units:
 - learn.wwl.purview-implement-manage-retention.create-publish-retention-label
 - learn.wwl.purview-implement-manage-retention.apply-retention-labels
 - learn.wwl.purview-implement-manage-retention.configure-event-based-retention
-- learn.wwl.purview-implement-manage-retention.auto-apply-retention-label
-- learn.wwl.purview-implement-manage-retention.declare-record
-- learn.wwl.purview-implement-manage-retention.disposition-review
 - learn.wwl.purview-implement-manage-retention.knowledge-check
 - learn.wwl.purview-implement-manage-retention.summary
 badge: