The previous link pointed to a non-existent ../range.html page. The corrected link now points to the proper anchor #ranges within the values documentation page, ensuring readers can access the friendly introduction as intended.
Restructure the documentation hierarchy to prepare for documenting additional built-in modules. Move all core library documentation from `doc/site/core/` to `doc/site/modules/core/`, rename `modules.markdown` to `modularity.markdown`, remove `^category` metadata lines from all affected pages, update cross-reference links to use relative paths under the new structure, and add a TODO placeholder to the Class class page.
Sven Bergström
Bob Nystrom