Various issues with  accelerate launch command for Large example
## Environment info
https://github.com/huggingface/transformers/tree/master/examples/pytorch/speech-pretraining

Python 3.6.9

## Information
I'm trying to run this command:
https://github.com/huggingface/transformers/tree/master/examples/pytorch/speech-pretraining#large

and found various issues with it:
1.  first line contains an erroneous space after the escape character:
`accelerate launch run_wav2vec2_pretraining_no_trainer.py \ `

2. The following line is missing the newline escape:
`--model_name_or_path=./ `

After fixing both I found another problem:

3. The value of --model_name_or_path is invalid: `./`

## Suggested Fix:
I fixed this with
` --model_name_or_path=patrickvonplaten/wav2vec2-large-xlsr-53-spanish-with-lm`

This command works now:
```
accelerate launch run_wav2vec2_pretraining_no_trainer.py \
	--dataset_name=librispeech_asr \
	--dataset_config_names clean clean other \
	--dataset_split_names train.100 train.360 train.500 \
	--output_dir=./test \
	--max_train_steps=200000 \
	--num_warmup_steps=32000 \
	--gradient_accumulation_steps=8 \
	--learning_rate=0.001 \
	--weight_decay=0.01 \
	--max_duration_in_seconds=20.0 \
	--min_duration_in_seconds=2.0 \
	--model_name_or_path=patrickvonplaten/wav2vec2-large-xlsr-53-spanish-with-lm \
	--logging_steps=1 \
	--saving_steps=10000 \
	--per_device_train_batch_size=2 \
	--per_device_eval_batch_size=4 \
	--adam_beta1=0.9 \
	--adam_beta2=0.98 \
	--adam_epsilon=1e-06 \
	--gradient_checkpointing
```
cc @patrickvonplaten <|||||>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.<|||||>Hey @ThomasGmeinder,

Thanks for spotting `1.` and `2.` - feel free to open a PR to correct the docs :-) 
The reason why I put `--model_name_or_path=./` is because this way you can train from your local directory, but the docs should have been cleaner here indeed<|||||>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/main/CONTRIBUTING.md) are likely to be ignored.