Fix task summary doctest 
The doctests are failing for the updated task summary page because outputs weren't included in the code examples. This PR adds real inputs that can be pipelined instead of the generic `("path/to/data/file")`. I skipped the `text-generation` pipeline, but let me know if you'd prefer setting a seed for it so we can still reliably generate an output.
_The documentation is not available anymore as the PR was closed or merged._