[code-reflection] Integrated: Update linq example.

[Paul Sandoz]

Align with the update to types in preparation for linq article.

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Commit messages:
 - Update linq example.

Changes: https://git.openjdk.org/babylon/pull/20/files
 Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=20&range=00
  Stats: 37 lines in 4 files changed: 0 ins; 0 del; 37 mod
  Patch: https://git.openjdk.org/babylon/pull/20.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/20/head:pull/20

PR: https://git.openjdk.org/babylon/pull/20