Computed columns only support basic data types, documented syntax also shows domains

[mrotteveel]

The documented syntax for computed columns in fblangref30-fblangref50 specifies that domains are allowed, that is not the case: only basic data types are supported. Update the language references.

See also FirebirdSQL/firebird#8635

[mrotteveel]

I seem to have introduced this error in the syntax when preparing fblangref30.