Added changes to about_arrays.rb to make it work

Learned a couple of new things:

* There are symbols in ruby that don't need to be defined to be used!

* That and index one passed the end of an array will get you the empty array

* But, an index more than one passed the end of the array will get you nil!

[#65851502]
* Learned about new arrays

[#65851502]
* Learned about array assignments

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* learned about accessing arrays and slicing arrays

[#65851502]
* Learned about arrays and ranges

* Learned about slicing and ranges

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* Learned about pushing and popping arrays

* Learned about shifting arrays

[#65851502]
* not sure why this was left over in the breaking up of commits.
Merge pull request #5 from ThomasCGreen/65851502_about_arrays_master

Added changes to about_arrays.rb to make it work

[Delivers #65851502]