outdated/incorrect S12 examples

[Darren Duncan]

I discovered in reading Synopsis 12 today that some code examples use 
out of date syntax, as I understand it:

For example, look in the "Roles" main documentation section.
There are many places where the bareword "self" is used, whereas I 
believe the current syntax is "$?SELF" for the same thing, and has 
been for awhile.

For example:

  self.some_other_method;

And:

  any reference to C<self> or the type of the invocant

And:

  C<self!attr()>

This problem may go beyond Synopsis 12, so I suggest doing a 
search'n'replace in all the synopsis.  Or at least in all of Synopsis 
12.

I'm fairly sure the "self" syntax is invalid.

Moreover, S12 explicitly says that Perl 6 has no barewords, save 
package names in specific circumstances.

-- Darren Duncan