Clarify automatic addition of the multiple attr (#35171)

Author: guardrex

aspnetcore/blazor/forms/input-components.md

@@ -327,7 +327,7 @@ In the following example:
 
 ## Multiple option selection with the `InputSelect` component
 
-Binding supports [`multiple`](https://developer.mozilla.org/docs/Web/HTML/Attributes/multiple) option selection with the <xref:Microsoft.AspNetCore.Components.Forms.InputSelect%601> component. The [`@onchange`](xref:mvc/views/razor#onevent) event provides an array of the selected options via [event arguments (`ChangeEventArgs`)](xref:blazor/components/event-handling#event-arguments). The value must be bound to an array type, and binding to an array type makes the [`multiple`](https://developer.mozilla.org/docs/Web/HTML/Attributes/multiple) attribute optional on the <xref:Microsoft.AspNetCore.Components.Forms.InputSelect%601> tag.
+Binding supports [`multiple`](https://developer.mozilla.org/docs/Web/HTML/Attributes/multiple) option selection with the <xref:Microsoft.AspNetCore.Components.Forms.InputSelect%601> component. The [`@onchange`](xref:mvc/views/razor#onevent) event provides an array of the selected options via [event arguments (`ChangeEventArgs`)](xref:blazor/components/event-handling#event-arguments). The value must be bound to an array type, which results in the <xref:Microsoft.AspNetCore.Components.Forms.InputSelect%601> component automatically adding the [`multiple` attribute](https://developer.mozilla.org/docs/Web/HTML/Attributes/multiple) to the `<select>` element when the component is rendered.
 
 In the following example, the user must select at least two starship classifications but no more than three classifications.