Assign description text to Description property of CommandProperty

[doingnz]

@ctacke In a few places the description text was assigned to the Name property of the CommandParameter attribute. This PR changes them to assign to Description property.

Example: Meadow.CLI\Source\v2\Meadow.CLI\Commands\Current\App\AppBuildCommand.cs

    [CommandParameter(0, Name = "Path to project file", IsRequired = false)]
    public string? Path { get; init; }