Add link to _doc_ids table

Author: marciw

specification/_doc_ids/table.csv

@@ -602,6 +602,7 @@ reroute-processor,https://www.elastic.co/docs/reference/enrich-processor/reroute
 render-search-template-api,https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-render-search-template
 reset-transform,https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-transform-reset-transform
 restore-snapshot,https://www.elastic.co/docs/deploy-manage/tools/snapshot-and-restore/restore-snapshot
+retrieve-stored-fields,https://www.elastic.co/docs/reference/elasticsearch/rest-apis/retrieve-stored-fields
 role-restriction,https://www.elastic.co/docs/deploy-manage/users-roles/cluster-or-deployment-auth/role-restriction
 rollup-agg-limitations,https://www.elastic.co/docs/manage-data/lifecycle/rollup/rollup-aggregation-limitations
 rollup-delete-job,https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-rollup-delete-job