adding not in docstring

[Govindskatyura]

Reference Issue

What does this implement/fix? Explain your changes.

Any other comments?

[codecov[bot]]

Codecov Report

Merging #907 (01dbe87) into master (6176807) will decrease coverage by 3.90%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #907      +/-   ##
==========================================
- Coverage   97.19%   93.28%   -3.91%     
==========================================
  Files          97       97              
  Lines        6348     6348              
  Branches      711      711              
==========================================
- Hits         6170     5922     -248     
- Misses        106      365     +259     
+ Partials       72       61      -11     

Impacted Files	Coverage Δ
imblearn/under_sampling/base.py	100.00% <ø> (ø)
imblearn/keras/tests/test_generator.py	7.93% <0.00%> (-92.07%)	:arrow_down:
imblearn/tensorflow/_generator.py	34.37% <0.00%> (-62.50%)	:arrow_down:
imblearn/tests/test_docstring_parameters.py	30.93% <0.00%> (-56.84%)	:arrow_down:
imblearn/tensorflow/tests/test_generator.py	10.75% <0.00%> (-54.84%)	:arrow_down:
imblearn/keras/_generator.py	47.36% <0.00%> (-44.74%)	:arrow_down:
imblearn/base.py	94.59% <0.00%> (-4.06%)	:arrow_down:
imblearn/datasets/tests/test_zenodo.py	89.18% <0.00%> (-2.71%)	:arrow_down:
imblearn/pipeline.py	93.47% <0.00%> (-1.09%)	:arrow_down:
imblearn/ensemble/_forest.py	89.30% <0.00%> (-0.63%)	:arrow_down:

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[glemaitre]

The docstring is fine. I don't think that we need changes there.