[2pt] feedback: Developer’s guide

[TarantoolBot]

Looks like part of #1651

Product: Cartridge
Audience/target: dev
Root document: https://www.tarantool.io/en/doc/latest/book/cartridge/cartridge_dev/#defining-role-dependencies
SME: @ yngvar-antonsson

The information the user is looking for can be found on the same page:
"If a custom role has dependent roles, the dependencies are registered and validated first, prior to the role itself."

---

<…>
implement the functions you need.

Defining role dependencies
|You can instruct the cluster to apply some other roles if your custom role
is enabled.|
For example:
-- Role dependencies defined in app/roles/custom-r<…>

https://www.tarantool.io/en/doc/latest/book/cartridge/cartridge_dev/#defining-role-dependencies

The documentation does not make it clear, whether it is guaranteed that a role will be initiaized strictly after all its dependencies.