Clarify use case for hybrid storage

[fulldecent]

My project makes the following assertion about hybrid storage:

Best practice with Aion is to use key-value storage for everything except recursive call state and configuration options which apply to all onchain transactions.

Argument in favor is that static storage is loaded on every call and therefore it is wasteful to load unneeded data.

This is a strong assertion and I'm not authoritative to make it. If AVM agrees, please add this note to documentation (I will provide PR if invited) so I can reference the Aion documentation rather than me (some random guy)'s opinion.