ASR_with_Subword_Tokenization.ipynb's guide on process_asr_text_tokenizer script is broken
**Describe the bug**

When following guide to Build a Customize Tokenizer, process_asr_text_tokenizer.py does not create intended tokenizer folder with required content. Unable to pre-trained on any models that use BPE vocab since no one can pass anything to the new_tokenizer_dir argument now. 

**Steps/Code to reproduce bug**
Try to run below command as taught by the tutorial, see if it works for you.
`!python /content/drive/MyDrive/Colab\sNotebooks/AI6127\sNLP/GroupProject/Data/process_asr_text_tokenizer.py \
  --manifest="/content/drive/MyDrive/Colab Notebooks/AI6127 NLP/GroupProject/Data/manifest_train.json" \
  --data_root="/content/drive/MyDrive/Colab Notebooks/AI6127 NLP/GroupProject/Data" \
  --vocab_size=32 \
  --tokenizer="spe" \
  --no_lower_case \
  --log`

**Expected behavior**

![image](https://user-images.githubusercontent.com/1837762/230006481-47a2e2e2-f0bf-4d95-8eae-2267bad5f565.png)

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

Colab Pro +

**Environment details**

NA
**Additional context**

NA
