Change default file size limit

[mikeshardmind]

Summary

Resolves #10083

Might be worth documenting that this is provided on a "best effort at time of release" means somewhere, but for now, this just covers what discord says the limit is.

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, ...)

[Rapptz]

I was going to do this one locally before cutting the release but this is fine. The value is incorrect though, the limit is 10 MiB not 10 MB.