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

AX Principle 2: comments must show concrete usage, not restate the
function name. "New creates a new Logger with the given configuration"
restated the signature — replaced with a callable example.

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

pkg/logging/logger.go

@@ -64,7 +64,8 @@ func DefaultConfig() Config {
 	}
 }
 
-// New creates a new Logger with the given configuration.
+// New creates a Logger with the given configuration.
+// logger := logging.New(logging.Config{Output: os.Stderr, Level: logging.LevelInfo, Component: "mining"})
 func New(cfg Config) *Logger {
 	if cfg.Output == nil {
 		cfg.Output = os.Stderr