[META] This is a pure comment commit.
They belong in the member declarations in the header file.
This is a backport of [[https://github.com/bitcoin/bitcoin/pull/19927 | core#19927]] [5/6]
https://github.com/bitcoin/bitcoin/pull/19927/commits/3756853b15902d63f4b5a3129e8b5d82e84e125b