Converting a few examples to using `$*ERR.say`
Converting a few examples to using `$*ERR.say`

So that they print to standard error. This closes #1722. Not *all* of
them have been changed. Also, we don't have a standard way of showing
the result of printing to standard error, se use OUTPUT everywhere. If
you think all examples should be changed, please reopen the issue.

stmuk/doc,tbrowder/doc,dmaestro/doc,stmuk/doc,dmaestro/doc,stmuk/doc,MasterDuke17/doc,tbrowder/doc,jonathanstowe/doc,perl6/doc,stmuk/doc,dmaestro/doc,dmaestro/doc,perl6/doc,jonathanstowe/doc,jonathanstowe/doc,jonathanstowe/doc,tbrowder/doc,tbrowder/doc,MasterDuke17/doc,perl6/doc,stmuk/doc,MasterDuke17/doc,jonathanstowe/doc,perl6/doc,MasterDuke17/doc,perl6/doc,dmaestro/doc