Insufficient documentation on ExampleWeightColumnName

`ExampleWeightColumnName` is not sufficiently explained.
From the information in the page I cannot deduce what is this actually doing.
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#### Document Details

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* ID: ff1457c6-de1c-ae4d-ae76-c083de96a4d5
* Version Independent ID: ab18e9b7-70e7-2991-c50c-03dbb2728848
* Content: [ColumnInformation Class (Microsoft.ML.AutoML)](https://learn.microsoft.com/en-us/dotnet/api/microsoft.ml.automl.columninformation?view=ml-dotnet-preview)
* Content Source: [dotnet/xml/Microsoft.ML.AutoML/ColumnInformation.xml](https://github.com/dotnet/ml-api-docs/blob/live/dotnet/xml/Microsoft.ML.AutoML/ColumnInformation.xml)
* Product: **dotnet-ml-api**
* GitHub Login: @natke
* Microsoft Alias: **nakersha**