This just renames a member of `HostConfiguration` from validation_upgrade_frequency to -//-_cooldown. As was already pointed out in #4460 the existing name is a misnomer, the member actually represents a minimum time period between upgrades, which is neatly expressed by a word cooldown. I've been planning this rename already for some time and the term is already used in paras module: https://github.com/paritytech/polkadot/blob/1394b70d493a3b4bea7a9ae14af094081bc84456/runtime/parachains/src/paras.rs#L1568-L1574
Preamble
This document aims to describe the purpose, functionality, and implementation of the host for Polkadot's parachains functionality - that is, the software which provides security and advancement for constituent parachains. It is not for the implementer of a specific parachain but rather for the implementer of the Parachain Host. In practice, this is for the implementers of Polkadot in general.
There are a number of other documents describing the research in more detail. All referenced documents will be linked here and should be read alongside this document for the best understanding of the full picture. However, this is the only document which aims to describe key aspects of Polkadot's particular instantiation of much of that research down to low-level technical details and software architecture.