Update the ExampleRegister test

Signed-off-by: Peter Jausovec <[email protected]>

Author: Peter Jausovec

prometheus/examples_test.go

@@ -282,7 +282,7 @@ func ExampleRegister() {
 	// taskCounter unregistered.
 	// taskCounterVec not registered: a previously registered descriptor with the same fully-qualified name as Desc{fqName: "worker_pool_completed_tasks_total", help: "Total number of tasks completed.", constLabels: {}, variableLabels: [worker_id]} has different label names or a different help string
 	// taskCounterVec registered.
-	// Worker initialization failed: inconsistent label cardinality
+	// Worker initialization failed: inconsistent label cardinality: expected 1 label values but got 2 in []string{"42", "spurious arg"}
 	// notMyCounter is nil.
 	// taskCounterForWorker42 registered.
 	// taskCounterForWorker2001 registered.