Docs: big_image_size_threshold xref typo in lib/media/load.php

[apermo]

Description

In lib/media/load.php, the cross-reference comment for the big_image_size_threshold filter points to wp-admin/includes/images.php, which does not exist. The correct file name is wp-admin/includes/image.php (singular).

Current

/** This filter is documented in wp-admin/includes/images.php */

Expected

/** This filter is documented in wp-admin/includes/image.php */

This PR was authored by Claude Code (AI) and reviewed by @apermo.