Clarify docs on Role based access control

[antejavor]

It looks like you need these permissions to create some node or relationship:

CREATE DATABASE db; GRANT ALL PRIVILEGES TO user; GRANT DATABASE TO user; GRANT CREATE_DELETE ON LABELS TO user; GRANT CREATE_DELETE ON EDGE_TYPES * TO user; SHOW USERS;

It is not sufficient to do GRANT ALL PRIVILEGES TOuser; GRANT DATABASE * TOuser;

We should revisit: https://memgraph.com/docs/database-management/authentication-and-authorization/role-based-access-control

Context: https://discord.com/channels/842007348272169002/1278498722270937158/1283321686376190054

[hal-eisen-MG]

Some new documentation was added in https://memgraph.com/docs/database-management/multi-tenancy