Serialize as something that can be deserialized

Author: davidwengier

src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/Formatting/RazorFormattingService.cs

@@ -92,7 +92,7 @@ public async Task<ImmutableArray<TextChange>> GetDocumentFormattingChangesAsync(
 
         var logger = _formattingLoggerFactory.CreateLogger(documentContext.FilePath, range is null ? "Full" : "Range");
         logger?.LogObject("Options", options);
-        logger?.LogObject("HtmlChanges", htmlChanges);
+        logger?.LogObject("HtmlChanges", htmlChanges.SelectAsArray(e => e.ToRazorTextChange()));
         logger?.LogObject("Range", range);
         logger?.LogSourceText("InitialDocument", sourceText);