Site Health: Add translator comment to explain Directories and Sizes.

This adds a translator comment to the Site Health's debug data to describe what "Directories and Sizes" refers to.

References:
- [https://make.wordpress.org/polyglots/handbook/translating/glotpress-translate-wordpress-org/types-of-messages/#strings-with-description Polyglots handbook: Strings with description]
- [https://codex.wordpress.org/I18n_for_WordPress_Developers#Descriptions I18N Codex: Descriptions]

Props oglekler, afragen, amitraj2203.
Fixes #61316.

git-svn-id: https://develop.svn.wordpress.org/trunk@58307 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-wp-debug-data.php

@@ -134,6 +134,7 @@ class WP_Debug_Data {
 
 		if ( ! $is_multisite ) {
 			$info['wp-paths-sizes'] = array(
+				/* translators: Filesystem directory paths and storage sizes. */
 				'label'  => __( 'Directories and Sizes' ),
 				'fields' => array(),
 			);