Update system-traces.md to use the Otel debug exporter

On v0.111.0, the logging exporter has been removed in favor of
the debug exporter. The logging exporter last version will be
v0.110.0 and it will be removed in all officially released distros.

Author: ChrsMark

content/en/docs/concepts/cluster-administration/system-traces.md

@@ -41,13 +41,14 @@ receivers:
       grpc:
 exporters:
   # Replace this exporter with the exporter for your backend
-  logging:
-    logLevel: debug
+  exporters:
+    debug:
+      verbosity: detailed
 service:
   pipelines:
     traces:
       receivers: [otlp]
-      exporters: [logging]
+      exporters: [debug]
 ```
 
 To directly emit traces to a backend without utilizing a collector,