[examples/mops] Fix mops.p6 for current Perl 6 (and Rakudo)
[examples/mops] Fix mops.p6 for current Perl 6 (and Rakudo)

* Fix pod for minimal Perl 6 compliance
* Uppercase name of MAIN subroutine so that it will be executed

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@37102 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot