Fix typo

[mrm8488]

No description provided.

[codecov]

Codecov Report

Merging #6469 into master will increase coverage by 0.76%.
The diff coverage is 87.43%.

@@            Coverage Diff             @@
##           master    #6469      +/-   ##
==========================================
+ Coverage   79.77%   80.53%   +0.76%     
==========================================
  Files         148      153       +5     
  Lines       27214    28001     +787     
==========================================
+ Hits        21710    22552     +842     
+ Misses       5504     5449      -55     

Impacted Files	Coverage Δ
src/transformers/configuration_reformer.py	100.00% <ø> (ø)
src/transformers/data/test_generation_utils.py	0.00% <0.00%> (ø)
src/transformers/modeling_marian.py	90.00% <ø> (-0.91%)	⬇️
src/transformers/modeling_utils.py	87.35% <ø> (ø)
src/transformers/trainer_tf.py	12.25% <0.00%> (-0.13%)	⬇️
src/transformers/testing_utils.py	51.92% <28.57%> (-20.81%)	⬇️
src/transformers/trainer.py	37.84% <37.50%> (-0.18%)	⬇️
src/transformers/modeling_tf_bert.py	98.38% <50.00%> (+1.79%)	⬆️
src/transformers/data/data_collator.py	90.90% <52.94%> (-5.68%)	⬇️
src/transformers/modeling_encoder_decoder.py	91.02% <66.66%> (-1.19%)	⬇️
... and 61 more

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[sgugger]

Thanks!