Cursor class attempts to access an private class member

[Villix-Main]

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The Cursor class that is showed in the code preview attempts to access the private member "parent._data" from it's constructor.

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#### Document Details

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* ID: cebd0074-01d3-d048-305a-cfea8b4083de
* Version Independent ID: 7f1aaf72-e345-e334-6237-d92abd3aa6d3
* Content: [IDataView Interface (Microsoft.ML)](https://docs.microsoft.com/en-us/dotnet/api/microsoft.ml.idataview?view=ml-dotnet#feedback)
* Content Source: [dotnet/xml/Microsoft.ML/IDataView.xml](https://github.com/dotnet/ml-api-docs/blob/live/dotnet/xml/Microsoft.ML/IDataView.xml)
* Product: **dotnet-ml-api**
* GitHub Login: @natke
* Microsoft Alias: **nakersha**

[mstfbl]

Hi @Villix-Main,

Thank you for notifying us of this oversight. I have opened a PR to fix this issue.