Add Doc Test GPT-2 (#16439)
* First Pass All Tests Pass
* WIP
* Adding file to documentation tests
* Change the base model for the example in the doc test.
* Fix Code Styling by running
make fixup
* Called Style
* Reverted to gpt2 model rather than distill gpt2
Then used a token classification model over a sequence model for an example.
* Fix Styling Issue
* Hopefully ignores the formatting issue.
Co-authored-by: ArEnSc <xx.mike.chung.xx@gmail.com>