MPU changes information

Hi,

We are trying to find information about what has changed for the MPU over the years.

Going back to documentations (edh_ed_handbooks) we can find that there was no changed between 2020.04 and 2021.10 but a large difference to the 2018.11.

We would like to know where to have information about what has been changed and when and if possible, documentation or release note about that change.

Thank you

Bertrand