More doctests
# What does this PR do?

Add all files (tokenization / image processor / feature extractor / processor) to doctests.
Currently the list is not sorted - it might be better to add a check to sort the list in order (in `utils/check_doctest_list.py`).
_The documentation is not available anymore as the PR was closed or merged._<|||||>Currently 46 failed tests - error message to be sent to Slack is too long and failed the report sending.
So I remove them for the list to be tested. Let's deal with them and add them back step by step, @amyeroberts 

For reference, here [the job run page](https://github.com/huggingface/transformers/actions/runs/4468541471/jobs/7849422399)

```bash
src/transformers/models/auto/tokenization_auto.py
src/transformers/models/bart/tokenization_bart.py
src/transformers/models/bart/tokenization_bart_fast.py
src/transformers/models/bertweet/tokenization_bertweet.py
src/transformers/models/blenderbot/tokenization_blenderbot.py
src/transformers/models/blenderbot/tokenization_blenderbot_fast.py
src/transformers/models/bloom/tokenization_bloom_fast.py
src/transformers/models/codegen/tokenization_codegen.py
src/transformers/models/codegen/tokenization_codegen_fast.py
src/transformers/models/deberta/tokenization_deberta.py
src/transformers/models/deberta/tokenization_deberta_fast.py
src/transformers/models/dpr/tokenization_dpr.py
src/transformers/models/dpr/tokenization_dpr_fast.py
src/transformers/models/gpt2/tokenization_gpt2.py
src/transformers/models/gpt2/tokenization_gpt2_fast.py
src/transformers/models/gptsan_japanese/tokenization_gptsan_japanese.py
src/transformers/models/gptsan_japanese/tokenization_gptsan_japanese.py
src/transformers/models/gpt_neox/tokenization_gpt_neox_fast.py
src/transformers/models/gpt_sw3/tokenization_gpt_sw3.py
src/transformers/models/led/tokenization_led.py
src/transformers/models/led/tokenization_led_fast.py
src/transformers/models/longformer/tokenization_longformer.py
src/transformers/models/longformer/tokenization_longformer_fast.py
src/transformers/models/luke/tokenization_luke.py
src/transformers/models/m2m_100/tokenization_m2m_100.py
src/transformers/models/marian/tokenization_marian.py
src/transformers/models/mvp/tokenization_mvp.py
src/transformers/models/mvp/tokenization_mvp_fast.py
src/transformers/models/roberta/tokenization_roberta.py
src/transformers/models/roberta/tokenization_roberta_fast.py
src/transformers/models/roformer/tokenization_roformer.py
src/transformers/models/roformer/tokenization_roformer_fast.py
src/transformers/models/transfo_xl/tokenization_transfo_xl.py
src/transformers/models/transfo_xl/tokenization_transfo_xl.py
src/transformers/models/auto/image_processing_auto.py
src/transformers/models/auto/feature_extraction_auto.py
src/transformers/models/markuplm/feature_extraction_markuplm.py
src/transformers/models/auto/processing_auto.py

```