Remove unnecessary construction of logging.Formatter in docs

docs/logging.rst

@@ -60,7 +60,6 @@ More advanced setups are possible with the :mod:`logging` module. The example be
         maxBytes=32 * 1024 * 1024,  # 32 MiB
         backupCount=5,  # Rotate through 5 files
     )
-    formatter = logging.Formatter()
     dt_fmt = '%Y-%m-%d %H:%M:%S'
     formatter = logging.Formatter('[{asctime}] [{levelname:<8}] {name}: {message}', dt_fmt, style='{')
     handler.setFormatter(formatter)