type name 'str' in Synopsis

[Darren Duncan]

Looking at Synopsis 12, I notice that the "Enums" section refers to a
"str" type, but Synopsis 6 doesn't, so there is an inconsistency here
that needs correcting.

At first I thought S12 could be updated to use "Str" instead, but
then when looking closer it seemed to me that the enum seemed to be
operating like a C enum, where every value corresponds to a native
integer, so perhaps "buf" is more appropriate. Or alternately, we
should see "Int" and "Str" here.

-- Darren Duncan