[jdk21u] RFR: 8318415: Adjust describing comment of os_getChildren after 8315026

[Matthias Baesken]

8318415: Adjust describing comment of os_getChildren after 8315026

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Commit messages:
 - Backport 47bb1a1cefa242c39c22a8f2aa08d7d357c260b9

Changes: https://git.openjdk.org/jdk21u/pull/277/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=277&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318415
  Stats: 15 lines in 2 files changed: 8 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk21u/pull/277.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/277/head:pull/277

PR: https://git.openjdk.org/jdk21u/pull/277