GH-46942: [Docs] Quote the version argument in versionadded directives

[mootari]

Rationale for this change

The Sphinx directive versionadded expects a version argument and an optional description of the change (docs). The Columnar Format docs pass "Arrow Columnar Format" (unquoted) to the directive, causing only "Arrow" to be rendered as version.

Fixes #46942

What changes are included in this PR?

Quotes the version label to prevent it from getting parsed as multiple arguments.

Are these changes tested?

Not yet. Depending on what the built preview will look like we may need to switch to a different directive like note:: instead.

Are there any user-facing changes?

Docs only.

• GitHub Issue: [Docs] versionadded directive used incorrectly in Columnar Format docs #46942

[github-actions]

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See also:

• Other pull requests
• Contribution Guidelines - Contributing Overview

[github-actions]

⚠️ GitHub issue #46942 has been automatically assigned in GitHub to PR creator.

[kou]

@github-actions crossbow submit preview-docs

[github-actions]

Revision: 4ebfb82

Submitted crossbow builds: ursacomputing/crossbow @ actions-dbff56dfa1

Task	Status
preview-docs

[mootari]

Well, that didn't work. I'll give escaped whitespaces a try, otherwise it's straight on to .. note::.

[mootari]

@github-actions crossbow submit preview-docs

[github-actions]

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The Archery job run can be found at: https://github.com/apache/arrow/actions/runs/16097562092

[kou]

@github-actions crossbow submit preview-docs

[github-actions]

Revision: 46ac00f

Submitted crossbow builds: ursacomputing/crossbow @ actions-4fa5abe911

Task	Status
preview-docs