Update broken link for Pragmatic Programmers Guide to Ruby #20
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I have updated the broken link for the "Pragmatic Programmers Guide to Ruby" in the README/documentation. The previous link (http://www.rubycentral.com/book/) was no longer accessible, so I replaced it with the working link (https://ruby-doc.com/docs/ProgrammingRuby/). This change will help users quickly find the right resource for learning Ruby.