chore(docs): remove get_default_handler call from setup docs (#421)

Author: csudcy

samples/snippets/handler.py

@@ -28,7 +28,6 @@ def use_logging_handler():
     # you're running in and integrates the handler with the
     # Python logging module. By default this captures all logs
     # at INFO level and higher
-    client.get_default_handler()
     client.setup_logging()
     # [END logging_handler_setup]