RFR: 8359224: G1: Incorrect size unit in logging of G1CollectedHeap::alloc_archive_region

[Albert Mingkun Yang]

Simple fixing incorrect unit (byte vs word) in logging.

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Commit messages:
 - g1-word-byte-size

Changes: https://git.openjdk.org/jdk/pull/25746/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25746&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8359224
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25746.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25746/head:pull/25746

PR: https://git.openjdk.org/jdk/pull/25746