Add doc tests for Albert and Bigbird (#16774)

* Add doctest BERT

* make fixup

* fix typo

* change checkpoints

* make fixup

* define doctest output value, update doctest for mobilebert

* solve fix-copies

* update QA target start index and end index

* change checkpoint for docs and reuse defined variable

* Update src/transformers/models/bert/modeling_tf_bert.py

Co-authored-by: Yih-Dar <2521628+ydshieh@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Yih-Dar <2521628+ydshieh@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Yih-Dar <2521628+ydshieh@users.noreply.github.com>

* make fixup

* Add Doctest for Albert and Bigbird

* make fixup

* overwrite examples for Albert and Bigbird

* Apply suggestions from code review

Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

* update longer examples for Bigbird

* using examples from squad_v2

* print out example text

* change name token-classification-big-bird checkpoint to random

Co-authored-by: Yih-Dar <2521628+ydshieh@users.noreply.github.com>
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

utils/documentation_tests.txt

@@ -6,11 +6,14 @@ docs/source/en/model_doc/t5v1.1.mdx
 docs/source/en/model_doc/byt5.mdx
 docs/source/en/model_doc/tapex.mdx
 src/transformers/generation_utils.py
+src/transformers/models/albert/modeling_albert.py
+src/transformers/models/albert/modeling_tf_albert.py
 src/transformers/models/bart/modeling_bart.py
 src/transformers/models/beit/modeling_beit.py
 src/transformers/models/bert/modeling_bert.py
 src/transformers/models/bert/modeling_tf_bert.py
 src/transformers/models/bigbird_pegasus/modeling_bigbird_pegasus.py
+src/transformers/models/big_bird/modeling_big_bird.py
 src/transformers/models/blenderbot/modeling_blenderbot.py
 src/transformers/models/blenderbot_small/modeling_blenderbot_small.py
 src/transformers/models/convnext/modeling_convnext.py