RFR: New example

[Jesper Wilhelmsson]

Changed to a better example.

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Commit messages:
 - New example

Changes: https://git.openjdk.org/guide/pull/137/files
  Webrev: https://webrevs.openjdk.org/?repo=guide&pr=137&range=00
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/guide/pull/137.diff
  Fetch: git fetch https://git.openjdk.org/guide.git pull/137/head:pull/137

PR: https://git.openjdk.org/guide/pull/137