YOLO26 finetuning notebooks markdown update

[sitammeur]

What does this PR do?

The dataset download section of the Roboflow Universe has an issue. The links provided for the datasets are incorrect, and the mention of YOLOv11 for dataset download format is misleading, as it should actually reference YOLO26. This pull request (PR) aims to fix these problems by updating the dataset links and correctly referencing the download format.

Type of Change

• Bug fix (non-breaking change that fixes an issue)

Testing

• I have tested this change locally
• I have added/updated tests for this change

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in hard-to-understand areas
• My changes generate no new warnings or errors
• I have updated the documentation accordingly (if applicable)

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[sitammeur]

For the YOLO26 segmentation notebook, the used car damage part segmentation dataset is located at: https://universe.roboflow.com/roboflow-jvuqo/car-part-detection-with-damage-part-ubaii. However, the dataset car-part-detection-with-damage-part-ubaii does not exist, has been deleted, or is not shared.

So, the download dataset section is throwing this error:

RoboflowError: {"error":{"message":"Unsupported request. `GET /roboflow-jvuqo/car-part-detection-with-damage-part-ubaii` does not exist or cannot be loaded due to missing permissions.","type":"GraphMethodException","hint":"You can see your active workspace by issuing a GET request to `/` with your `api_key`."}}

cc: @SkalskiP

[CLAassistant]

All committers have signed the CLA.