Add comment to clarify logger aggregation

src/BinSkim.Driver/MultithreadedAnalyzeCommand.cs

@@ -57,6 +57,7 @@ public override BinaryAnalyzerContext InitializeGlobalContextFromOptions(Analyze
                 var ruleTelemetryLogger = new RuleTelemetryLogger(this.Telemetry.TelemetryClient);
                 ruleTelemetryLogger.AnalysisStarted();
 
+                // Combine rule telemetry with any other loggers that may be present.
                 aggregatingLogger.Loggers.Add(context.Logger);
                 aggregatingLogger.Loggers.Add(ruleTelemetryLogger);
                 context.Logger = aggregatingLogger;