Make sure to not return an equivalent (but not equal) syntax tree

Author: sharwell

OpenStackNetAnalyzers/OpenStackNetAnalyzers/RenderAsMarkdownCodeFix.cs

@@ -122,6 +122,9 @@ private async Task<Document> CreateChangedDocument(CodeFixContext context, Docum
 
             SyntaxNode root = await context.Document.GetSyntaxRootAsync(cancellationToken);
             SyntaxNode newRoot = root.ReplaceNode(documentationCommentTriviaSyntax, contentsOnly);
+            if (documentationCommentTriviaSyntax.IsEquivalentTo(contentsOnly))
+                return context.Document;
+
             return context.Document.WithSyntaxRoot(newRoot);
         }