Ruby: Project: Caesar Cipher: Fix Ruby Caesar Cipher code example

[JeffreyMPrice]

Because

There is an internal inconsistency on whether a caesar cipher should use a left shift or right shift. In the entry from Wikipedia the text and example used a left shift, while in the ruby code a right shift is used.

  > caesar_cipher("What a string!", 5)
  => "Bmfy f xywnsl!"

This PR

Update the project instructions to explicitly call for a right shift and note that the Wikipedia quote uses a left shift.

Issue

Closes #29106

Additional Information

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[JeffreyMPrice]

Thanks @JoshDevHub ! I'll wait for the assignment next time.

I've reverted the change in output and updated the instructions to explicitly call for a right shift. I added to the quick tips that Wikipedia shows a left shift. Also threw in fixing a lower case Caesar.

You are right about all the submitted solutions! I didn't think about that.