[i18n-ar] Translated file : docs/source/ar/tasks/sequence_classification.md into Arabic

[AhmedAlmaghz]

What does this PR do?

Translated the docs/source/ar/tasks/sequence_classification.md file of the documentation to Arabic العربية. I use transformers for my side-project and wanted to contribute. As a beginner, this seemed appropriate.

Some questions:

• I can't access the pr documentation endpoint for Arabic العربية. Is there a missing step?
• I left all the other files alone after copying the English docs. Is this acceptable for future updates or should I add contents to the _toctree.yml only when translation is complete? Should I delete all other files for a cleaner review?
• In Arabic, people use both Transformer and المحولات to describe the model. However, as this is more of a product of HuggingFace I opted not to translate it. May you please let me know which you would prefer?

Thank you in advance for your review.

Part of #32435

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, Pull Request section?
• Was this discussed/approved via a Github issue or the forum ?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, and here are tips on formatting docstrings.
• Did you write any new necessary tests?

Who can review?

@stevhliu , @MKhalusova , @abodacs, may you please review this PR?

[AhmedAlmaghz]

مرحباً أخي عبالله @abodacs
هذه قائمة المهام التالية للترجمة والمراجعة

TASK GUIDES

NATURAL LANGUAGE PROCESSING

• Text classification
• Token classification
• Question answering
• Causal language modeling
• Masked language modeling
• Translation
• Summarization
• Multiple choice

AUDIO

• Audio classification
• Automatic speech recognition

COMPUTER VISION

• Image classification
• Image segmentation
• Video classification
• Object detection
• Zero-shot object detection
• Zero-shot image classification
• Depth estimation
• Image-to-Image
• Image Feature Extraction
• Mask Generation
• Keypoint Detection
• Knowledge Distillation for Computer Vision

Multimodal

• Image captioning
• Document Question Answering
• Visual Question Answering
• Text to speech
• Image-text-to-text
• Video-text-to-text

Generation

• Customize the generation strategy
• Best Practices for Generation with Cache

Prompting

• Image tasks with IDEFICS
• LLM prompting guide

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