Tutorial BUG
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**Describe the bug**

1. `GPTDatasetConfig` got unexpected keyword `mmap_bin_files` (can be solved if I install main of Megatron LM instead of megatron-core-r0.5)
2. `GPTDatasetConfig` got unexpected keyword `is_build_on_rank`
3. merge file and vocab file seem to be useless, since `AutoTokenizer` downloads `gpt2` repo anyway.

**Steps/Code to reproduce bug**

follow https://docs.nvidia.com/deeplearning/nemo/user-guide/docs/en/main/nlp/nemo_megatron/gpt/gpt_training.html

**Environment overview (please complete the following information)**

Cuda 12
Torch 2.1
Megatron-LM 9de386d08770d7296263a590171ace4ae45348ad
NeMo e64b2227b4759665187d061784927d2f9d0868b3