Corrected a few tests of "Phone Number" (emacs-lisp #465)

[borderite]

• Revised the following tests using the canonical test data, as suggested by BNAndras.

  cleans-number-test
  cleans-numbers-with-dots-test
  valid-when-11-digits-and-first-is-1-test

• Revised the following tests specific for "Phone Number" to conform the requirements for phone numbers.

  area-code-test
  pprint-test
  pprint-full-us-phone-number-test

[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

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[no important files changed]

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