[DOCS] Update version info in rank vectors page (#136263)

Author: leemthompo

docs/reference/elasticsearch/mapping-reference/rank-vectors.md

@@ -1,18 +1,13 @@
 ---
-navigation_title: "Rank Vectors"
+navigation_title: "Rank vectors"
+applies_to:
+  stack: preview 9.0
+  serverless: preview
 mapped_pages:
   - https://www.elastic.co/guide/en/elasticsearch/reference/current/rank-vectors.html
-  # That link will 404 until 8.18 is current
-  # (see https://www.elastic.co/guide/en/elasticsearch/reference/8.18/rank-vectors.html)
 ---
 
-# Rank Vectors [rank-vectors]
-
-
-::::{warning}
-This functionality is in technical preview and may be changed or removed in a future release. Elastic will work to fix any issues, but features in technical preview are not subject to the support SLA of official GA features.
-::::
-
+# Rank vectors [rank-vectors]
 
 The `rank_vectors` field type enables late-interaction dense vector scoring in Elasticsearch. The number of vectors per field can vary, but they must all share the same number of dimensions and element type.