RFR: 2338: Fix trivial typo in numeral

[Pavel Rappo]

The bug is insignificant and only affects generated emails; for example:

 * https://mail.openjdk.org/pipermail/core-libs-dev/2021-October/082663.html
 * https://mail.openjdk.org/pipermail/core-libs-dev/2024-February/118754.html

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/skara/pull/1681/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1681&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2338
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/skara/pull/1681.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1681/head:pull/1681

PR: https://git.openjdk.org/skara/pull/1681