[2pt] Add API-related recommendations to Translation Guidelines

[patiencedaur]

Product: Tarantool
Audience/target: translation team; TWs?
Root document: https://www.tarantool.io/en/doc/latest/contributing/docs/localization/guide/
SME: @ patiencedaur, @ veod32

What to write about

• How are "return" and "return type" automatically rendered by Sphinx? describe the case of "возвращает: таблицу" instead of "возвращает: таблица"

Definition of done

• There is a new section in Tarantool Translation Guidelines, titles API