[2.x] TDB (iproto): document release 2.2.2

**Product:** Tarantool DataBase
**Since:** 2.2.2
**Audience/target:** all
**Root document:** https://www.tarantool.io/en/tarantooldb/doc/2.x/
**Jira:** https://jira.vk.team/browse/PRODUCTS-3538
**SME:** @ a1div0 Сергей Фомин
**Release date:** 04.12.25

# Details

- proofread changelogs
- proofread minor doc additions (bugfixes), including https://jira.vk.team/browse/TNTP-4806
