[refactor] [addrman] Update constant comments
Summary:
Completes backport of core#22740:
https://github.com/bitcoin/bitcoin/pull/22740/commits/85b15ddc8ff499fe21d8ab35ece3994f8878b3de#diff-164bd9e2e30f54d0a79eb7cc372309e2f2155edc6c3f051290ab078f03f6a771
Depends on D12286.
Test Plan:
ninja all check
Reviewers: #bitcoin_abc, PiRK
Reviewed By: #bitcoin_abc, PiRK
Differential Revision: https://reviews.bitcoinabc.org/D12288