Perl6: Add many more smartmatch examples. Make the ternary operator clearer (#2472)

* Explain that you cannot pass immutable values like integers to subs even if you use $n is rw.

* Add myself as a contributor

* Remove contributor since I am not a major contributor

* Add many more smartmatch examples. Make the ternary operatory clearer and add a code example for it. Make the section for && and || have a working code example and show the output it gives

* Fix assigning $a $b and $c values in the && operator section

* Rename a few things so they don't conflict with variables in other parts of the code

* Remove extra dashes

* Move description of smartmatch type checks toward the end of that section

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