Other tweaks to intro.pod to explain the new calling conventions rather than the old ones.
Other tweaks to intro.pod to explain the new calling conventions rather than the old ones.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@16117 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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