TDB (iproto): create and proofread the `Releases` section

[xuniq]

Epic: #4002
Product: Tarantool DB
Root document:

• to be created: https://github.com/tarantool/tarantooldb/blob/master/doc/releases/

SME: @ a1div0 @ Galiev-Ruslan

Details

Structure

• Состав продукта
• Публикуемые версии
• Changelog

Definition of done

• proofread the section: language, style, formatting
• add and update links if needed

[xuniq]

Merged in scope of https://github.com/tarantool/tarantooldb/pull/304