Docs: Correct type for WP_Screen screen settings.

[ArkaPrabhaChowdhury]

Trac ticket: https://core.trac.wordpress.org/ticket/56607

Summary

• Correct the documented type of WP_Screen::$_screen_settings.
• Account for the property being null until show_screen_options() initializes it.

The ticket's other proposed type changes have already been addressed by later commits or are no longer applicable to current trunk.

Testing

• php -l src/wp-admin/includes/class-wp-screen.php
• phpcbf --standard=phpcs.xml.dist src/wp-admin/includes/class-wp-screen.php
• phpcs --standard=phpcs.xml.dist src/wp-admin/includes/class-wp-screen.php

[Copilot]

Pull request overview

Updates the WP_Admin WP_Screen documentation to accurately reflect that $_screen_settings is not populated until show_screen_options() runs, aligning the property’s PHPDoc with its lifecycle in the class.

Changes:

• Corrected the PHPDoc type for WP_Screen::$_screen_settings from string to string|null to reflect its initial null state prior to initialization.

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[github-actions]

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