Hooks/Docs: legacy load-*.php actions in admin.php missing xref to load-{$pagenow}

[apermo]

Problem

5 legacy page-load hooks in wp-admin/admin.php have no PHPDoc or cross-reference comment. They are aliases for the dynamic load-{$pagenow} hook, whose canonical PHPDoc is earlier in the same file.

Affected locations

• src/wp-admin/admin.php:398 — do_action( 'load-page-new.php' )
• src/wp-admin/admin.php:400 — do_action( 'load-page.php' )
• src/wp-admin/admin.php:404 — do_action( 'load-categories.php' )
• src/wp-admin/admin.php:406 — do_action( 'load-edit-link-categories.php' )
• src/wp-admin/admin.php:409 — do_action( 'load-edit-tags.php' )

Fix

Add /** This action is documented in wp-admin/admin.php */ above each call, pointing to the primary load-{$pagenow} PHPDoc block.

Related to https://core.trac.wordpress.org/ticket/64224