fix: Add note in Grounding notebook about waiting for data ingestion …

…with VAIS

gemini/grounding/intro-grounding-gemini.ipynb

@@ -482,7 +482,9 @@
     "\n",
     "Note: The data store must be in the same project that you are using for Gemini.\n",
     "\n",
-    "Once you've created a data store, obtain the Data Store ID and input it below."
+    "Once you've created a data store, obtain the Data Store ID and input it below.\n",
+    "\n",
+    "Note: You will need to wait for data ingestion to finish before using a data store with grounding. For more information, see [create a data store](https://cloud.google.com/generative-ai-app-builder/docs/create-data-store-es)"
    ]
   },
   {