No comment on behavior when sending the pipeline as parameter to AutoML experiment

When sending a `pipeline` containing `DropColumns` to a string type column to Execute of AutoML experiment as the `preFeaturizer` there is an exception `ArgumentOutOfRangeException: Could not find input column 'StringColumn' (Parameter 'inputSchema')`.

Perhaps consider adding documentation to this behavior either on this page or on AutoML Execute page.

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#### Document Details

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* ID: f9a0f970-a53e-b319-f210-15cb90c741fe
* Version Independent ID: dce66202-02e1-ce5f-b9da-a6df7dfb4950
* Content: [TransformExtensionsCatalog.DropColumns(TransformsCatalog, String\[\]) Method (Microsoft.ML)](https://learn.microsoft.com/en-us/dotnet/api/microsoft.ml.transformextensionscatalog.dropcolumns?view=ml-dotnet)
* Content Source: [dotnet/xml/Microsoft.ML/TransformExtensionsCatalog.xml](https://github.com/dotnet/ml-api-docs/blob/live/dotnet/xml/Microsoft.ML/TransformExtensionsCatalog.xml)
* Product: **dotnet-ml-api**
* GitHub Login: @natke
* Microsoft Alias: **nakersha**