Docs(concepts): replace "routine" with "method" for clarity

  1. The term “routine” is potentially ambiguous in documentation.
  2. The opening sentence already refers to them as “16 methods of Regexp”, so this change ensures terminology consistency throught out the introduction.
  3. This improves readability for new developers.
    https://github.com/exercism/go/pull/2972
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Reopening the PR with comments.

This has been merged

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