GitLab

Switch `official/nlp/bert` to `official/legacy/bert` for open sourced model garden.

This is giving a 404

PiperOrigin-RevId: 470764412

PiperOrigin-RevId: 467055112

PiperOrigin-RevId: 465401547

PiperOrigin-RevId: 457713840

Since this has moved repo, the links are 404ing. The GCS link is still referring to the old file but it's the only `fine_tune_bert.ipynb` in that bucket.

PiperOrigin-RevId: 457621873

From: https://github.com/tensorflow/text/blob/master/docs/tutorials/fine_tune_bert.ipynb
To: https://github.com/tensorflow/models/blob/master/docs/nlp/fine_tune_bert.ipynb

Fixes: https://github.com/tensorflow/text/issues/945
PiperOrigin-RevId: 457556249

PiperOrigin-RevId: 456569753