fix `pipeline_tutorial.mdx` doctest
# What does this PR do?

Fix [doctest failure](https://github.com/huggingface/transformers/runs/7942633458?check_suite_focus=true) due to the incorrect expected values.

(It's probably just because the previous values are obtained in a different env. or hardware)
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_18717). All of your documentation changes will be reflected on that endpoint.