remove TODO to make these properties static as they now are in fact static

Author: Mpdreamz

src/Elastic.Markdown/Myst/MarkdownParser.cs

@@ -27,7 +27,6 @@ public class MarkdownParser(
 
 	private BuildContext Context { get; } = context;
 
-	//TODO directive properties are stateful, rewrite this so we can cache builders
 	public static MarkdownPipeline MinimalPipeline { get; } =
 		new MarkdownPipelineBuilder()
 			.UseDiagnosticLinks()