[jdk22] RFR: 8323159: Consider adding some text re. memory zeroing in Arena::allocate [v2]

[Per Minborg]

> 8323159: Consider adding some text re. memory zeroing in Arena::allocate

Per Minborg has updated the pull request incrementally with one additional commit since the last revision:

  Add missing comma in TestScope.java

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Changes:
  - all: https://git.openjdk.org/jdk22/pull/77/files
  - new: https://git.openjdk.org/jdk22/pull/77/files/45c100bb..9fa7cf85

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk22&pr=77&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk22&pr=77&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk22/pull/77.diff
  Fetch: git fetch https://git.openjdk.org/jdk22.git pull/77/head:pull/77

PR: https://git.openjdk.org/jdk22/pull/77