DOC: update whatsnew section for pd.col()

[jorisvandenbossche]

This expands the section a bit, trying to explain more what it actually is and can do. And also emphasized that it is "initial" support, to avoid people expect that it could be used everywhere (or to the extent that it can be used in other libraries like polars and pyspark)

For another issue, but we should also add a section about it in the user guide to refer to with a more complete / up to date description of how it can be used.

cc @MarcoGorelli

[MarcoGorelli]

thanks!

[Copilot]

Pull request overview

This PR enhances the documentation for the newly introduced pd.col() feature in pandas 3.0.0. The update expands the whatsnew section to provide clearer explanation of what pd.col() is, what it can do, and its current limitations. The changes also add a version annotation to the function's docstring and emphasize that this is "initial" support to set appropriate expectations.

• Expanded whatsnew section with better explanation of pd.col() purpose and capabilities
• Added versionadded directive to the col() function docstring
• Clarified current scope and future expansion plans for the feature

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
pandas/core/col.py	Added versionadded directive (3.0.0) to the col() function docstring
doc/source/whatsnew/v3.0.0.rst	Expanded and restructured the pd.col() documentation section with clearer explanations, examples, and scope limitations

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[mroeschke]

Thanks @jorisvandenbossche