docs(Grid): update broken links

[heloiselui]

Closes #19359

Fix broken documentation links in Column.tsx and Grid overview page. The previous URLs under @see tags were returning 404 errors. These have been updated to point to the correct layout breakpoints documentation in the Carbon Design System site.

Changelog

Changed

• Updated outdated @see links in Column.tsx to use the correct URLs: https://carbondesignsystem.com/elements/2x-grid/overview/#breakpoints
• Updated corresponding links in Grid.mdx

Testing / Reviewing

To verify this PR:

1. Open the changed file Column.tsx and verify that the updated links are working correctly
2. Confirm that each link now points to a valid section on the Carbon Design System site (no more 404 errors)
3. Navigate to Deploy Preview > Grid > Overview
4. Check that the "2x Grid" and "Gutter" link directs to the correct page on the Carbon Design System site and no longer returns a 404 error.

PR Checklist

As the author of this PR, before marking ready for review, confirm you:

• Reviewed every line of the diff
• Updated documentation and storybook examples
• [N/A] Wrote passing tests that cover this change
• [N/A] Addressed any impact on accessibility (a11y)
• Tested for cross-browser consistency
• Validated that this code is ready for review and status checks should pass

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.85%. Comparing base (97b21a8) to head (3708f74).
Report is 33 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19368      +/-   ##
==========================================
+ Coverage   84.57%   84.85%   +0.28%     
==========================================
  Files         382      371      -11     
  Lines       14434    14412      -22     
  Branches     4712     4746      +34     
==========================================
+ Hits        12207    12229      +22     
+ Misses       2073     2037      -36     
+ Partials      154      146       -8     

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