TRIVIAL: docstring fix

[Mara3l]

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Build succeeded (check pipeline).

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Sonar scan result

More detail, see in https://sonarqube-gate.intgdc.com/dashboard?id=gooddata-python-sdk-gate-PR382

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[codecov-commenter]

Codecov Report

Merging #382 (7ddac24) into master (25e98c9) will decrease coverage by 0.03%.
Report is 4 commits behind head on master.
The diff coverage is 89.79%.

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@@            Coverage Diff             @@
##           master     #382      +/-   ##
==========================================
- Coverage   91.21%   91.19%   -0.03%     
==========================================
  Files          88       90       +2     
  Lines        5907     6005      +98     
==========================================
+ Hits         5388     5476      +88     
- Misses        519      529      +10     

Files	Coverage Δ
...ooddata-pandas/gooddata_pandas/result_convertor.py	93.78% <ø> (ø)
gooddata-sdk/gooddata_sdk/__init__.py	100.00% <100.00%> (ø)
...sdk/catalog/organization/entity_model/directive.py	95.45% <95.45%> (ø)
...a_sdk/catalog/organization/entity_model/setting.py	95.65% <95.65%> (ø)
...a-sdk/gooddata_sdk/catalog/organization/service.py	88.54% <84.31%> (-4.80%)	⬇️

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Build succeeded (gate pipeline).

• https://checklist.intgdc.com/job/compliance/job/gooddata-python-sdk-fossa-scanning-zuul/194/ : FAILURE in 1m 59s (non-voting)
• https://checklist.intgdc.com/job/compliance/job/gooddata-python-sdk-sonarqube-scan-zuul-gate/344/ : SUCCESS in 57s
• https://checklist.intgdc.com/job/compliance/job/gooddata-python-sdk-merge-compliance-check/347/ : SUCCESS in 9s