Improve messaging for accepted Custom Formats scoring upgrades

Co-authored-by: bakerboy448 <55419169+bakerboy448@users.noreply.github.com>

Closes #9496

src/NzbDrone.Core/DecisionEngine/Specifications/UpgradableSpecification.cs

@@ -78,7 +78,12 @@ namespace NzbDrone.Core.DecisionEngine.Specifications
                 return false;
             }
 
-            _logger.Debug("New item has a better custom format score");
+            _logger.Debug("New item's custom formats [{0}] ({1}) improve on [{2}] ({3}), accepting",
+                newCustomFormats.ConcatToString(),
+                newFormatScore,
+                currentCustomFormats.ConcatToString(),
+                currentFormatScore);
+
             return true;
         }