Example script to edit kenlm arpa file does not work correctly in kaggle notebook
## Environment info
<!-- You can run the command `transformers-cli env` and copy-and-paste its output below.
     Don't forget to fill out the missing fields in that output! -->

Kaggle Python environment with GPU acceleration
- `transformers` version: 4.12.5
- Platform: Linux-5.10.68+-x86_64-with-debian-bullseye-sid
- Python version: 3.7.12
- PyTorch version (GPU?): 1.9.1 (True)
- Tensorflow version (GPU?): 2.6.2 (True)
- Flax version (CPU?/GPU?/TPU?): 0.3.6 (gpu)
- Jax version: 0.2.25
- JaxLib version: 0.1.70
- Using GPU in script?: No
- Using distributed or parallel set-up in script?: No

### Who can help
@patrickvonplaten 

The problem arises when using:
* [ ] the official example scripts: (give details below) https://huggingface.co/blog/wav2vec2-with-ngram


The tasks I am working on is: Training KenLM and using KenLM with xlsr

## To reproduce

Steps to reproduce the behavior:
At step:
![image](https://user-images.githubusercontent.com/25264037/149226114-7f52e449-f319-4893-97b0-1a1b333b4f99.png)

if I run it like that my output in kenlm.arpa is (count is updated correctly but < /s > line is not added )
![image](https://user-images.githubusercontent.com/25264037/149225404-074f09b7-8ad0-42c2-9a71-44057dcabdae.png)

Once I  change that code above to (Inserting that change as a code block did not make the problem visible, sublime code and kaggle notebook images below)
![image](https://user-images.githubusercontent.com/25264037/149228896-ef8a0893-a16e-47f1-9eb8-9a67ece01aea.png)



![image](https://user-images.githubusercontent.com/25264037/149227673-de309990-3b1f-4d68-9df7-78823095e6c9.png)



I get correct output
![image](https://user-images.githubusercontent.com/25264037/149225552-0b657b14-5ae2-4885-9bac-20261f2e262d.png)


## Expected behavior

<!-- A clear and concise description of what you would expect to happen. -->

I see thanks a lot for reporting the problem here! Indeed, the regex I use in the blog is not general enough. I'll change it! Thanks a lot for reporting it here and seems like you solved your problem already :-)<|||||>Should be fixed here: https://github.com/huggingface/blog/pull/206<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/master/CONTRIBUTING.md) are likely to be ignored.<|||||>Fixed