docs(docs): add link for ALPHAVANTAGE_API_KEY generation in integration notebook (#32364)

docs(alpha_vantage): add link for ALPHAVANTAGE_API_KEY generation in
integration notebook

**Description:**

This PR updates the `docs/docs/integrations/tools/alpha_vantage.ipynb`
integration notebook to help users locate the API key registration page
for Alpha Vantage. The following markdown line was added:

---------

Co-authored-by: Mason Daugherty <mason@langchain.dev>
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Dhanesh Gujrathi 2025-08-04 03:49:44 +08:00 committed by GitHub
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@ -9,7 +9,9 @@
"source": [
"# Alpha Vantage\n",
"\n",
">[Alpha Vantage](https://www.alphavantage.co) Alpha Vantage provides realtime and historical financial market data through a set of powerful and developer-friendly data APIs and spreadsheets. \n",
">[Alpha Vantage](https://www.alphavantage.co) Alpha Vantage provides realtime and historical financial market data through a set of powerful and developer-friendly data APIs and spreadsheets.\n",
"\n",
"Generate the `ALPHAVANTAGE_API_KEY` [at their website](https://www.alphavantage.co/support/#api-key)\n.",
"\n",
"Use the ``AlphaVantageAPIWrapper`` to get currency exchange rates."
]