Sealed + ref struct

src/Markdig/MarkdownPipeline.cs

@@ -127,7 +127,7 @@ public sealed class MarkdownPipeline
         }
     }
 
-    internal readonly struct RentedHtmlRenderer : IDisposable
+    internal readonly ref struct RentedHtmlRenderer : IDisposable
     {
         private readonly HtmlRendererCache _cache;
         public readonly HtmlRenderer Instance;

src/Markdig/Syntax/MarkdownObject.cs

@@ -153,7 +153,7 @@ public abstract class MarkdownObject : IMarkdownObject
         return Unsafe.As<T>(storage.Trivia);
     }
 
-    private class DataEntriesAndTrivia
+    private sealed class DataEntriesAndTrivia
     {
         private struct DataEntry(object key, object value)
         {

src/Markdig/Syntax/QuoteBlock.cs

@@ -25,7 +25,7 @@ public class QuoteBlock : ContainerBlock
 
     /// <summary>
     /// Gets or sets the trivia per line of this QuoteBlock.
-    /// Trivia: only parsed when <see cref="MarkdownPipeline.TrackTrivia"/> is enabled, otherwise null.
+    /// Trivia: only parsed when <see cref="MarkdownPipeline.TrackTrivia"/> is enabled.
     /// </summary>
     public List<QuoteBlockLine> QuoteLines => Trivia;