Fix docstring annotations for better rendering online

[andriichumak]

It seems that docstring annotations are quite fragile and have to follow very strict indentation rules to be parsed correctly by Sphinx autodoc. We should investigate if it's possible to automate this with some linters.

[ghost]

Build succeeded (check pipeline).

[codecov-commenter]

Codecov Report

Merging #131 (80a5682) into master (f7ad8b2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #131   +/-   ##
=======================================
  Coverage   91.82%   91.82%           
=======================================
  Files          70       70           
  Lines        4209     4209           
=======================================
  Hits         3865     3865           
  Misses        344      344           

Impacted Files	Coverage Δ
gooddata-fdw/gooddata_fdw/column_utils.py	94.11% <ø> (ø)
gooddata-pandas/gooddata_pandas/dataframe.py	100.00% <ø> (ø)
gooddata-pandas/gooddata_pandas/series.py	95.00% <ø> (ø)
.../gooddata_sdk/catalog/workspace/model_container.py	85.71% <ø> (ø)
...data-sdk/gooddata_sdk/catalog/workspace/service.py	95.95% <ø> (ø)
...oddata-sdk/gooddata_sdk/compute/model/execution.py	87.73% <ø> (ø)
gooddata-sdk/gooddata_sdk/compute/service.py	100.00% <ø> (ø)
gooddata-sdk/gooddata_sdk/insight.py	77.31% <ø> (ø)
gooddata-sdk/gooddata_sdk/support.py	93.93% <ø> (ø)
gooddata-sdk/gooddata_sdk/table.py	84.95% <ø> (ø)
... and 2 more

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[yenkins]

Sonar scan result

More detail, see in https://sonarqube-gate.intgdc.com/dashboard?id=gooddata-python-sdk-gate-PR131

To scan for vulnerabilities in dependencies and run unit tests (to get coverage report in sonar) please comment your PR with 'extended check sonar'.

[ghost]

Build succeeded (gate pipeline).

• https://checklist.intgdc.com/job/compliance/job/gooddata-python-sdk-sonarqube-scan-zuul-gate/116/ : SUCCESS in 54s
• https://checklist.intgdc.com/job/compliance/job/gooddata-python-sdk-fossa-scanning-zuul-el7/116/ : FAILURE in 12s (non-voting)
• https://checklist.intgdc.com/job/compliance/job/gooddata-python-sdk-merge-compliance-check/118/ : SUCCESS in 18s