ax(logging): replace prose comment on WithComponent with usage example

Co-Authored-By: Charon <charon@lethean.io>

pkg/logging/logger.go

@@ -77,7 +77,9 @@ func New(cfg Config) *Logger {
 	}
 }
 
-// WithComponent returns a new Logger with the specified component name.
+// WithComponent returns a child logger scoped to a sub-system.
+// child := logger.WithComponent("xmrig")
+// child.Info("miner started")
 func (l *Logger) WithComponent(component string) *Logger {
 	return &Logger{
 		output:    l.output,