docs: updated incorrect datatype for custom tool notebook (#31498)
- **Description:** `"string"` is given as the `"type"` for a custom tool
argument, even though it is an `integer`. This can be validated from the
Colab notebook output.
- **Issue:** N/A
- **Dependencies:** N/A
- **Twitter handle:** [mrityu___](https://x.com/mrityu___)
Current:

After Change:

Colab Output:
