What does Interp Speed mean?

Hi, reading this documentation here: TInterp To | Unreal Engine Documentation

I cannot determine what exactly Interp Speed means.

Can I please get some explanation on that.

Also, I’ve noticed a lot of the documentation is starting to get either outdated or is lacking in explanation/examples (e.g. Interp Speed). Is there anything we(I) can do to help to notify you of the lacking information?

Thanks,

Robert.