Perl 6: Make information about Hash tables correct. Rewrite the example for dynamically scoped variables.. (#2475)

* 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

* Better names for scoping examples

* Redo the example for dynamically scoped variables so the example is better and functions properly when ran (old example did not work properly when running it by itself)

* Rename these classes so they aren't named the same as the ones above

* Add information about the different twigils in Perl 6. This makes understanding what $. $! and $* are and how they relate. Also complete the renaming in the previous commit

* Fix capitalization and indenting here

* Using the word interpolate to mean accessing an element of an array is not the proper terminology. Using the word interpolate is usually associated with things such as this: say "@names = { @names.perl }"

* Make the wording a little clearer for arrays

* Remove incorrect information about hashes.  Hashes are not arrays of pairs although Perl 6 makes it easy to use them as such

* Make the subroutine text read better

* Clean up the Object Model introduction section

* Fix the section on interpolating all elements of an array

* Use the word attribute instead of field since this is the wording that the perl 6 documentation uses for these objects

* Fix column width in a few places

* More clearly mark which twigils are used for "normal" variables and which ones are used on "objects". This makes the flow from the # Scoping => # Twigil => # Object Model section smoother

* Semi-rewrite the example for object inheritance and use more natural names.  Also rename class A to class Attrib-Class

* Clean up the scoping introduction a little

* Remove a leftover line from rewriting the inheritance example

* More gradually introduce exceptions and fix a typo, as well as adding a few examples

* Reorder introduction of packages to be more natural. Show how to "use" a package before we show how to create and declare our own modules

* Avoid using the word 'use' because we're not refering to the perl keyword 'use'

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