[Doctest] Add configuration_time_series_transformer.py
Author: SD-13
Pull request: yes

# What does this PR do?

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Fixes part of issue https://github.com/huggingface/transformers/issues/19487.
Adds `configuration_time_series_transformer.py` to `Doc tests`.


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Models:

- albert, bert, xlm: @LysandreJik
- blenderbot, bart, marian, pegasus, encoderdecoder,  t5: @patrickvonplaten, @patil-suraj
- longformer, reformer, transfoxl, xlnet: @patrickvonplaten
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- tokenizers: @n1t0, @LysandreJik
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Comments:
Hey @ydshieh, I just had a doubt

> Change the import order of the model and configuration classes

here, which order do you mean, the ascending or descending? because in `configuration_time_series_transformer.py`, it was already in ascending order.

@ydshieh, By mistake, I pushed some merged changes, I will revert them soon.

_The documentation is not available anymore as the PR was closed or merged._

@ydshieh PTAL. Thanks,

> A time series of pull request and pull accept! Thanks!

That sounds AWESOME!!