Updates to US Handbook (2024 & 401k details)

Why is this change being made?

Updates to US Handbook (2024 & 401k details). Updating details on some 2024 programs and 401k loan and in-plan conversion details.

💡 Provide a detailed answer to the question on why this change is being proposed, in accordance with our value of Transparency.

CHANGEME - add the details saying why, not just what.

Author and Reviewer Checklist

Please verify the check list and ensure to tick them off before the MR is merged.

• [x ] Provided a concise title for this Merge Request (MR)
• [ x] Added a description to this MR explaining the reasons for the proposed change, per say why, not just what
  • Copy/paste the Slack conversation to document it for later, or upload screenshots. Verify that no confidential data is added, and the content is SAFE
• Assign reviewers for this MR to the correct Directly Responsible Individual/s (DRI)
  • If the DRI for the page/s being updated isn’t immediately clear, then assign it to one of the people listed in the Maintained by section on the page being edited
  • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies
  • The when to get approval handbook section explains the workflow in more detail

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