Marian docstring
# What does this PR do?
related to #16292
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## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
- [ ] Did you read the [contributor guideline](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md#start-contributing-pull-requests),
      Pull Request section?
- [ ] Was this discussed/approved via a Github issue or the [forum](https://discuss.huggingface.co/)? Please add a link
      to it if that's the case.
- [ ] Did you make sure to update the documentation with your changes? Here are the
      [documentation guidelines](https://github.com/huggingface/transformers/tree/main/docs), and
      [here are tips on formatting docstrings](https://github.com/huggingface/transformers/tree/main/docs#writing-source-documentation).
- [ ] Did you write any new necessary tests?


## Who can review?
 @ydshieh, @patrickvonplaten 
Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
members/contributors who may be interested in your PR.

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Models:

- albert, bert, xlm: @LysandreJik
- blenderbot, bart, marian, pegasus, encoderdecoder,  t5: @patrickvonplaten, @patil-suraj
- longformer, reformer, transfoxl, xlnet: @patrickvonplaten
- fsmt: @stas00
- funnel: @sgugger
- gpt2: @patrickvonplaten, @LysandreJik
- rag: @patrickvonplaten, @lhoestq
- tensorflow: @LysandreJik

Library:

- benchmarks: @patrickvonplaten
- deepspeed: @stas00
- ray/raytune: @richardliaw, @amogkam
- text generation: @patrickvonplaten
- tokenizers: @n1t0, @LysandreJik
- trainer: @sgugger
- pipelines: @LysandreJik

Documentation: @sgugger

HF projects:

- datasets: [different repo](https://github.com/huggingface/datasets)
- rust tokenizers: [different repo](https://github.com/huggingface/tokenizers)

Examples:

- maintained examples (not research project or legacy): @sgugger, @patil-suraj
- research_projects/bert-loses-patience: @JetRunner
- research_projects/distillation: @VictorSanh

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I need some help. This is my first time contributing to a project ever. I'm getting familiar with the process of git, and I've tried to follow the instructions layed out on the [Community Event] Doc Tests Sprint #16292. I ran the doc test locally and received to errors. But upon further inspection, I can't seem to find what the issue is. Please if you can offer come guidance on what I'm doing wrong and how to progress. I'm working on modeling_tf_marian.py <|||||>![Screenshot 2022-10-13 223655](https://user-images.githubusercontent.com/75712292/195965122-349001fc-b173-488c-a790-cede71b8bf4a.png)
<|||||>@traveler-pinkie sorry for being late here. Are you still interested in working on Marian config files?<|||||>@ydshieh . Thanks for commenting back. But I think at the moment I should probably study a little bit more. It looks like I was having more difficulty then I should have. With my skills currently. I think it's best if someone else works on it. Sorry and thank you