Remove commented line in training arguments

Author: yulinhuang

chapters/2_FineTune/fine-tuning-bert-example.ipynb

@@ -483,7 +483,6 @@
     "    warmup_ratio=warmup,\n",
     "    weight_decay=decay,\n",
     "    logging_dir='./logs',\n",
-    "    # logging_steps=log_steps,\n",
     "    logging_strategy=logging_strategy,\n",
     "    eval_strategy=eval_strategy,\n",
     "    save_strategy=save_strategy,\n",