transformers

9badcecf - [Doctests] Make TFRoberta-like meaningfull (#16370)

[Doctests] Make TFRoberta-like meaningfull (#16370) * update doc examples for TFRoberta * fix style * fix style * use TF ckpt * apply suggestion * add the code file to test here * fix style Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>