Update IViewForAttribute XML docs for Splat registration

Clarifies XML documentation to specify that ViewModel (T) is registered in the Splat service locator, instead of IViewFor<T>. Adds new received test file for .NET 10.0 verifying the generated attribute code.

Author: ChrisPulman

src/ReactiveUI.SourceGenerator.Tests/IVIEWFOR/IViewForGeneratorTests.FromIViewFor#ReactiveUI.SourceGenerators.IViewForAttribute.g.verified.cs

@@ -28,7 +28,7 @@ internal sealed class IViewForAttribute<T> : global::System.Attribute
 
     /// <summary>
     /// Gets the Splat registration type for Splat View Model registration.
-    /// Registers IViewFor<T> in the Splat service locator.
+    /// Registers the ViewModel (T) in the Splat service locator.
     /// </summary>
     public SplatRegistrationType ViewModelRegistrationType { get; init; } = SplatRegistrationType.None;
 }
@@ -52,7 +52,7 @@ internal sealed class IViewForAttribute(string? viewModelType) : global::System.
 
     /// <summary>
     /// Gets the Splat registration type for Splat View Model registration.
-    /// Registers IViewFor<T> in the Splat service locator.
+    /// Registers the ViewModel (T) in the Splat service locator.
     /// </summary>
     public SplatRegistrationType ViewModelRegistrationType { get; init; } = SplatRegistrationType.None;
 }