Small refactoring. Finally made use of the type parameter in NadekoTypeReader<T> class

src/NadekoBot/Common/Yml/CommentAttribute.cs

@@ -1,6 +1,7 @@
 #nullable disable
 namespace NadekoBot.Common.Yml;
 
+[AttributeUsage(AttributeTargets.Property)]
 public class CommentAttribute : Attribute
 {
     public string Comment { get; }

src/NadekoBot/Common/Yml/CommentGatheringTypeInspector.cs

@@ -10,7 +10,7 @@ public class CommentGatheringTypeInspector : TypeInspectorSkeleton
     private readonly ITypeInspector _innerTypeDescriptor;
 
     public CommentGatheringTypeInspector(ITypeInspector innerTypeDescriptor)
-        => _innerTypeDescriptor = innerTypeDescriptor ?? throw new ArgumentNullException("innerTypeDescriptor");
+        => _innerTypeDescriptor = innerTypeDescriptor ?? throw new ArgumentNullException(nameof(innerTypeDescriptor));
 
     public override IEnumerable<IPropertyDescriptor> GetProperties(Type type, object container)
         => _innerTypeDescriptor.GetProperties(type, container).Select(d => new CommentsPropertyDescriptor(d));