Fix poa components docstring

[r0hansaxena]

• Closes Inexistent function reference in pvlib.irradiance.poa_components #2089
• I am familiar with the contributing guidelines
• I attest that all AI-generated material has been vetted for accuracy and is in compliance with the pvlib license
• Adds description and name entries in the appropriate "what's new" file in docs/sphinx/source/whatsnew for all changes. Includes link to the GitHub Issue with :issue:\num`or this Pull Request with:pull:`num`. Includes contributor name and/or GitHub username (link with :ghuser:`user``).
• Pull request is nearly complete and ready for detailed review.
• Maintainer: Appropriate GitHub Labels (including remote-data) and Milestone are assigned to the Pull Request and linked Issue.

[github-actions]

Hey @r0hansaxena! 🎉

Thanks for opening your first pull request! We appreciate your
contribution. Please ensure you have reviewed and understood the
contributing guidelines.

If AI is used for any portion of this PR, you must vet the content
for technical accuracy.

[AdamRJensen]

User should be listed at the bottom of the whatsnew file.

[cwhanse]

Thanks @r0hansaxena !