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Building documentation generates a lot of warnings

See original GitHub issue

Describe the problem

Building documentation for read-the-docs at the current master generates a lot of warnings. Commit from which it started: b1c6e75f4c8442195e8551b561ba62479cac75c4 Reproducer:

cd MODIN_ROOT_FOLDER/docs
python -m sphinx -T -E -b html -d _build/doctrees -D language=en . _build/html

Output:

WARNING: autodoc: failed to import module 'spreadsheet.general' from module 'modin'; the following exception was raised:
Please `pip install modin[spreadsheet]` to install the spreadsheet extension
WARNING: autodoc: failed to import module 'spreadsheet.general' from module 'modin'; the following exception was raised:
Please `pip install modin[spreadsheet]` to install the spreadsheet extension
WARNING: autodoc: failed to import module 'grid' from module 'modin_spreadsheet'; the following exception was raised:
No module named 'modin_spreadsheet'
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.clip:17: WARNING: Inline strong start-string without end-string.
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.cummax:11: WARNING: Inline strong start-string without end-string.
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.cummin:11: WARNING: Inline strong start-string without end-string.
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.cumprod:11: WARNING: Inline strong start-string without end-string.
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.cumsum:11: WARNING: Inline strong start-string without end-string.
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.to_latex:92: WARNING: Unexpected section title.

Returns
-------
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.to_sql:68: WARNING: Duplicate explicit target name: "1".
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.to_sql:69: WARNING: Footnote [2] is not referenced.
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.to_pickle:15: WARNING: Duplicate target name, cannot be used as a unique reference: "1".
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.to_sql:3: WARNING: Duplicate target name, cannot be used as a unique reference: "1".
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.dropna:3: WARNING: undefined label: missing_data (if the link has no caption the label must precede a section header)
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.ewm:95: WARNING: undefined label: window.exponentially_weighted (if the link has no caption the label must precede a section header)
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.iloc:22: WARNING: undefined label: indexing.integer (if the link has no caption the label must precede a section header)
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.loc:25: WARNING: undefined label: indexing.label (if the link has no caption the label must precede a section header)
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.mask:50: WARNING: undefined label: indexing.where_mask (if the link has no caption the label must precede a section header)
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.reindex:196: WARNING: undefined label: basics.reindexing (if the link has no caption the label must precede a section header)
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.to_hdf:11: WARNING: undefined label: io.hdf5 (if the link has no caption the label must precede a section header)
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.to_hdf:59: WARNING: undefined label: io.hdf5-query-data-columns (if the link has no caption the label must precede a section header)
modin\modin\pandas\base.py:docstring of modin.pandas.base.BasePandasDataset.to_sql:43: WARNING: undefined label: io.sql.method (if the link has no caption the label must precede a section header)