DataGridCell.IsReadOnly documentation talks about setting the property while it is readonly.

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**Issue moved from MicrosoftDocs/feedback#2933**
- Please respond to @kunom.

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_From @kunom on Friday, July 10, 2020 6:31:17 AM_

https://docs.microsoft.com/en-us/dotnet/api/system.windows.controls.datagridcell.isreadonly?view=netframework-4.6.2#System_Windows_Controls_DataGridCell_IsReadOnly

**Describe the bug**
The Remarks section says: _Set the IsReadOnly property to true to make an individual cell read-only_.

But the property is not assignable: `public bool IsReadOnly { get; }`.

So: either extend the implementation (which would be a good thing) or fix the documentation.