This PR improves the model card for the StreamingChat model by:
- Updating the `pipeline_tag` from `visual-question-answering` to `video-text-to-text` for a more accurate categorization of the model's functionality in streaming video understanding and multi-turn dialogues.
- Adding `library_name: transformers` as evidence from the GitHub README (`pip install transformers`) and `config.json` confirms compatibility with the Hugging Face Transformers library, enabling the automated "how to use" widget.
- Correcting the introductory sentence from "This dataset card" to "This model card" for improved accuracy.
