GH-48668: [PYTHON][DOCS] Add python examples for compute functions min/max/min_max

[zhengruifeng]

Rationale for this change

To improve python documentation

What changes are included in this PR?

Add python examples for compute functions min/max/min_max

Are these changes tested?

Yes, doc-test

Are there any user-facing changes?

Doc-only changes

• GitHub Issue: Add code examples for compute function min/max/min_max #48668

[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}

See also:

• Other pull requests
• Contribution Guidelines - Contributing Overview

[github-actions]

⚠️ GitHub issue #48668 has been automatically assigned in GitHub to PR creator.