Add syntax docs to error message.
Add syntax docs to error message.

Prime other `version` definitions to avoid shadowing
from Meta.version.

AndreasPK/stack,deech/stack,juhp/stack,anton-dessiatov/stack,Fuuzetsu/stack,juhp/stack,anton-dessiatov/stack,martin-kolinek/stack,mrkkrp/stack,MichielDerhaeg/stack,AndreasPK/stack,martin-kolinek/stack,Fuuzetsu/stack,mrkkrp/stack,deech/stack,MichielDerhaeg/stack