Generate: TF sample doctest result update
# What does this PR do?

Updates sample's output to match the [expected output in CI](https://github.com/huggingface/transformers/actions/runs/3457499228/jobs/5770974732), which has a GPU. 

(The previous output was for a CPU device -- sampling has different outputs for the same seed depending on the hardware, due to implementation differences.)
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_20208). All of your documentation changes will be reflected on that endpoint.<|||||>>  But here do you mean some specific implementation differences in the generation method?

No, all differences are just at hardware level :)