GH-41587: [Docs][Python] Remove duplicate contents

[llama90]

Rationale for this change

Remove duplicate contents

What changes are included in this PR?

• Remove duplicate contents
• Remove , for consistency

Are these changes tested?

Yes

Are there any user-facing changes?

No

• GitHub Issue: [Docs] Duplicate contents #41587

[github-actions]

Thanks for opening a pull request!

If this is not a minor PR. Could you open an issue for this pull request on GitHub? https://github.com/apache/arrow/issues/new/choose

Opening GitHub issues ahead of time contributes to the Openness of the Apache Arrow project.

Then could you also rename the pull request title in the following format?

GH-${GITHUB_ISSUE_ID}: [${COMPONENT}] ${SUMMARY}

or

MINOR: [${COMPONENT}] ${SUMMARY}

In the case of PARQUET issues on JIRA the title also supports:

PARQUET-${JIRA_ISSUE_ID}: [${COMPONENT}] ${SUMMARY}

See also:

• Other pull requests
• Contribution Guidelines - Contributing Overview

[github-actions]

⚠️ GitHub issue #41587 has been automatically assigned in GitHub to PR creator.

[llama90]

@AlenkaF Hello. Would you take a look at this PR when you get a chance? Thanks!

[AlenkaF]

Thank you for fixing this!

[conbench-apache-arrow]

After merging your PR, Conbench analyzed the 0 benchmarking runs that have been run so far on merge-commit a0c0ffd.

None of the specified runs were found on the Conbench server.

The full Conbench report has more details.