Update combobox.md to remove not yet existing multi selection property "SelectedItems".

AvaloniaUI / avalonia-docs

https://docs.avaloniaui.net/docs/welcome

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Closed LazaroOnline closed 2 months ago

LazaroOnline commented 3 months ago

Remove non existing property for multi selection that is not yet implemented. Fixes: https://github.com/AvaloniaUI/avalonia-docs/issues/505