New timestamp format style

[Sacul0457]

Summary

This PR adds the new s and S timestamp format styles and updates the example output.
Relevant PR: discord/discord-api-docs#7922

Ion think a version added this needed for this right?

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)