api: Add instruction how to get release url from release model

[Roker2]

I thought, that to need to add it.

[RadiationX]

But the url field is not in this model.
The description of how to get the url needs to be moved to another place.

[Roker2]

For example? Maybe to https://github.com/anilibria/docs/blob/master/api.md#%D1%80%D0%B5%D0%BB%D0%B8%D0%B7%D1%8B ?

[RadiationX]

Maybe.
You can make "Примечания" as here: https://github.com/anilibria/docs/blob/master/api.md#авторизация

[Roker2]

Moved.

[RadiationX]

But not to auth. This note must be in release-api description.