[docs] fix some bugs in the PIR examples, mark them as valid
[docs] fix some bugs in the PIR examples, mark them as valid

Remove some no-longer needed 'end' opcodes (This is PIR, not PASM)
Fixup some horizontal whitespace in code.



git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@38801 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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