Agile Web Development with Rails 8: Iteration L1 Ruby 3.3.4 workaround paragraph no longer needed (B4 PDF p. 280)

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The B4 version still has a paragraph about the Ruby 3.3.4 work-around and using sed in the Dockerfile. It’s no longer needed because it’s not in the Dockerfile anymore in B4 (which uses 3.4.2).