Typo in tokenization_utils.py
avoir -> avoid
# [Codecov](https://codecov.io/gh/huggingface/transformers/pull/2286?src=pr&el=h1) Report
> Merging [#2286](https://codecov.io/gh/huggingface/transformers/pull/2286?src=pr&el=desc) into [master](https://codecov.io/gh/huggingface/transformers/commit/23dad8447c8db53682abc3c53d1b90f85d222e4b?src=pr&el=desc) will **increase** coverage by `0.18%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/huggingface/transformers/pull/2286/graphs/tree.svg?width=650&token=9qOlN6Hb1c&height=150&src=pr)](https://codecov.io/gh/huggingface/transformers/pull/2286?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master    #2286      +/-   ##
==========================================
+ Coverage   74.27%   74.45%   +0.18%     
==========================================
  Files          85       85              
  Lines       14610    14610              
==========================================
+ Hits        10851    10878      +27     
+ Misses       3759     3732      -27
```


| [Impacted Files](https://codecov.io/gh/huggingface/transformers/pull/2286?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [src/transformers/tokenization\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/2286/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy90b2tlbml6YXRpb25fdXRpbHMucHk=) | `92.08% <ø> (+0.77%)` | :arrow_up: |
| [src/transformers/modeling\_tf\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/2286/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl91dGlscy5weQ==) | `93.12% <0%> (+1.58%)` | :arrow_up: |
| [src/transformers/pipelines.py](https://codecov.io/gh/huggingface/transformers/pull/2286/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9waXBlbGluZXMucHk=) | `68.31% <0%> (+2.32%)` | :arrow_up: |
| [src/transformers/modeling\_tf\_auto.py](https://codecov.io/gh/huggingface/transformers/pull/2286/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl9hdXRvLnB5) | `32.14% <0%> (+7.14%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/huggingface/transformers/pull/2286?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/huggingface/transformers/pull/2286?src=pr&el=footer). Last update [23dad84...7cef764](https://codecov.io/gh/huggingface/transformers/pull/2286?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
