added two links

Author: rsill-neo4j

modules/ROOT/pages/directives/indexes-and-constraints.adoc

@@ -259,6 +259,7 @@ Queries are performed by passing in either a vector index or a query phrase.
 
 A query by vector index finds nodes with a vector embedding similar to that index.
 That is, the query performs a nearest neighbor search.
+Refer to link:https://neo4j.com/docs/cypher-manual/current/indexes/semantic-indexes/vector-indexes/#query-vector-index[Query vector indexes] for the 
 
 In contrast, a query by phrase (a string of text) forwards the phrase to the link:https://neo4j.com/docs/cypher-manual/current/genai-integrations/[Neo4j GenAI plugin] and the plugin generates a vector embedding for it.
 This embedding is then compared to the node vector embeddings in the database.
@@ -267,7 +268,7 @@ This embedding is then compared to the node vector embeddings in the database.
 .Prerequisites
 ==== 
 * The database must be Neo4j version 5.15 or higher.
-* The node vector embeddings already exist in the database.
+* The node vector embeddings already exist in the database. See link:https://neo4j.com/docs/cypher-manual/current/indexes/semantic-indexes/vector-indexes/[Vector indexes] to learn more about vector indexes in Cypher and Neo4j.
 * The embeddings must have been created using the same method.
 * Queries by vector index cannot be performed across multiple labels.
 * Queries by phrase require credentials for the Neo4j GenAI plugin.
@@ -303,7 +304,8 @@ input VectorIndexInput {
 }
 ----
 
-If the optional field `provider` is set, the type is used for a query by phrase, otherwise for a query by vector index. 
+If the optional field `provider` is set, the type is used for a query by phrase, otherwise for a query by vector index.
+Allowed values for the `provider` field are defined by the available link:https://neo4j.com/docs/cypher-manual/current/indexes/semantic-indexes/vector-indexes/[GenAI providers].
 
 === Usage