fix short title error

Author: shyam-cb

capella-model-services/haystack/query_based/frontmatter.md

@@ -2,7 +2,7 @@
 # frontmatter
 path: "/tutorial-capella-model-services-haystack-rag-with-hyperscale-and-composite-vector-index"
 title: "RAG with Haystack, Capella Model Services and Couchbase Hyperscale & Composite Vector Indexes"
-short_title: "RAG with Haystack, Capella Model Services and Hyperscale & Composite Vector Indexes"
+short_title: "RAG with Haystack, Capella Model Services and Couchbase Vector Indexes"
 description:
   - Learn how to build a semantic search engine using Couchbase Hyperscale and Composite Vector Indexes.
   - This tutorial demonstrates how Haystack integrates Couchbase vector search capabilities with embeddings generated by Capella Model Services.