Fix HGNetV2 Model Card and Image Classification Pipeline Usage Tips
Author: ducviet00
Pull request: yes

# What does this PR do?

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1. The HGNetV2 model card previously referenced an incorrect paper and has now been updated to accurately describe the model, following the guidelines in https://github.com/huggingface/transformers/issues/36979. 
2. I also corrected the contributed model card to fix usage tips for the image-classification pipeline: the pipeline expects `inputs` as a positional argument, not `images`. 
3. Additionally, I fixed a typo by closing the `<hfoptions>` tag in the dit section.

## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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Models:

- text models: @ArthurZucker
- vision models: @amyeroberts, @qubvel
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Library:

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Comments:
@stevhliu 
Please take a look when you have time 🤗 


**[For maintainers]** Suggested jobs to run (before merge)

run-slow: hgnet_v2

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_39965). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

run-slow: hgnet_v2

This comment contains run-slow, running the specified jobs: 

models: ['models/hgnet_v2']
quantizations: [] ...