Update basesegdataset.py

[morkovka1337]

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Motivation

Makes docstring to be consistent with actual argument name.

Modification

Minor fix

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repos?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

No

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMDet3D.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Base: 83.32% // Head: 83.41% // Increases project coverage by +0.08% 🎉

Coverage data is based on head (4bd27fc) compared to base (d505ec1).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2492      +/-   ##
===========================================
+ Coverage    83.32%   83.41%   +0.08%     
===========================================
  Files          145      145              
  Lines         8451     8451              
  Branches      1259     1259              
===========================================
+ Hits          7042     7049       +7     
+ Misses        1204     1194      -10     
- Partials       205      208       +3     

Flag	Coverage Δ
unittests	83.41% <ø> (+0.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmseg/datasets/basesegdataset.py	98.97% <ø> (ø)
mmseg/datasets/transforms/transforms.py	90.95% <0.00%> (+0.97%)	⬆️

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