docs: improve documentation for OneHotEncoder

[lars-reimann]

Closes #181.

Summary of Changes

Improve documentation of OneHotEncoder.

[lars-reimann]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	1	0	0	0.44s
✅ PYTHON	mypy	1		0	1.59s
✅ PYTHON	ruff	1	0	0	0.04s
✅ REPOSITORY	git_diff	yes		no	0.03s

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[codecov]

Codecov Report

Merging #298 (d391637) into main (d34492a) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #298   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           43        43           
  Lines         1704      1704           
=========================================
  Hits          1704      1704           

Impacted Files	Coverage Δ
...ds/data/tabular/transformation/_one_hot_encoder.py	100.00% <ø> (ø)

[lars-reimann]

🎉 This PR is included in version 0.12.0 🎉

The release is available on:

• v0.12.0
• GitHub release

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