Fix typo in 'length'

[alex-hse-repository]

IMPORTANT: Please do not create a Pull Request without creating an issue first.

Before submitting (must do checklist)

• Did you read the contribution guide?
• Did you update the docs? We use Numpy format for all the methods and classes.
• Did you write any new necessary tests?
• Did you update the CHANGELOG?

Type of Change

• Examples / docs / tutorials / contributors update
• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves an existing feature)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Proposed Changes

Fix typo in 'length'

Related Issue

Closing issues

[codecov-commenter]

Codecov Report

Merging #212 (6077f1c) into master (e441865) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #212   +/-   ##
=======================================
  Coverage   88.31%   88.31%           
=======================================
  Files          76       76           
  Lines        3518     3518           
=======================================
  Hits         3107     3107           
  Misses        411      411           

Impacted Files	Coverage Δ
etna/models/nn/deepar.py	100.00% <ø> (ø)
etna/models/nn/tft.py	100.00% <ø> (ø)
etna/analysis/outliers/sequence_outliers.py	96.55% <100.00%> (ø)
etna/transforms/outliers.py	98.78% <100.00%> (ø)

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[julia-shenshina]

Update changelog please with "Fix typo in methods ... arguments"