templates: Update Vector Store RAG.json (#8977)

Update Vector Store RAG.json

Co-authored-by: Eric Hare <ericrhare@gmail.com>

src/backend/base/langflow/initial_setup/starter_projects/Vector Store RAG.json

@@ -459,7 +459,7 @@
                 "trace_as_input": true,
                 "trace_as_metadata": true,
                 "type": "str",
-                "value": "What is the document is about?"
+                "value": "What is this document about?"
               },
               "sender": {
                 "advanced": true,
@@ -4786,4 +4786,4 @@
     "rag",
     "q-a"
   ]
-}
+}