[DOCS] Incorrect variable name used in dataset push example (https://distilabel.argilla.io/latest/sections/pipeline_samples/papers/ultrafeedback/#code)

[Hassaan-Qaisar]

Which page or section is this issue related to?

https://github.com/argilla-io/distilabel/blob/main/docs/sections/pipeline_samples/papers/ultrafeedback.md
https://distilabel.argilla.io/latest/sections/pipeline_samples/papers/ultrafeedback/#code

What are you documenting, or what change are you making in the documentation?

In the documentation, there is a discrepancy in variable names. The variable distiset is defined when running the pipeline, but dataset is used when pushing to the hub. This will cause confusion and errors when users follow the documentation.