GH-49723: [C++][FlightRPC][ODBC] Update ODBC Documentation

[justing-bq]

Rationale for this change

Update ODBC Documentation in preparation for public release.
Resolves #49723

What changes are included in this PR?

Miscellaneous doc changes.

Are these changes tested?

N/A

Are there any user-facing changes?

No

• GitHub Issue: [C++][FlightRPC][ODBC] Documentation: Connection Options for Unix Systems #49723

[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 #49723 has been automatically assigned in GitHub to PR creator.

[justing-bq]

@lidavidm @kou
Please take a look when you have time.

[kou]

This includes a space. Is it correct?

[justing-bq]

Yes this is one of the keys accepted by the driver.

[Copilot]

Pull request overview

Updates documentation for the Arrow Flight SQL ODBC driver to better support Unix/macOS users ahead of public release (GH-49723), including a new reference for connection properties and expanded install/registration steps across platforms.

Changes:

• Add a new connection-options.md document describing connection string / DSN properties.
• Update ODBC README with Windows/macOS/Linux driver binary locations and registration commands.
• Add a Linux-specific known limitation note for isql.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 14 comments.

File	Description
cpp/src/arrow/flight/sql/odbc/connection-options.md	New doc describing ODBC connection properties and defaults.
cpp/src/arrow/flight/sql/odbc/README.md	Expanded registration instructions for macOS/Linux and updated known limitations.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

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[alinaliBQ]

+1

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

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