[2pt] feedback: Developer’s guide

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.

Open the linked Cartridge developer guide at the “Defining role dependencies” section and review the existing explanation and example. Confirm whether initialization is guaranteed to occur after all dependent roles, then update the documentation to state the ordering clearly and verify the rendered page.