XML doc comments in wrong places for types with primary constructors plus other feedback

[mmusu3]

After commit 94050a4 XML comments are quite broken now.

Also StructDefaultConstructorsAndFieldInitializers = false doesn't seem to work anymore and so primary constructors being generated on more structs even though they are not required and PreferPrimaryConstructorIfPossible was removed so I can't choose my preference of false.

Input

/// <summary>
/// This is a information about the parent class
/// </summary>
class C11(int value)
{
    public int Value => value;

    /// <summary>
    /// This is a different info about the nested class
    /// </summary>
    public class Nested
    {
    }

    /// <summary>
    /// Method description
    /// </summary>
    public void Test()
    {
    }
}

Output

/// <summary>
/// This is a information about the parent class
/// </summary>
private class C11(/// <summary>
/// This is a different info about the nested class
/// </summary>
/// <summary>
/// Method description
/// </summary>
int value)
{
	public class Nested
	{
	}

	public int Value => value;

	public void Test()
	{
	}
}