RFR: 8358653: [s390] Clean up comments regarding frame manager

[Amit Kumar]

Basic comment cleanup; replaces "frame manager" by "template interpreter".

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Commit messages:
 - cleanup

Changes: https://git.openjdk.org/jdk/pull/25653/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25653&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358653
  Stats: 15 lines in 6 files changed: 0 ins; 0 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/25653.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25653/head:pull/25653

PR: https://git.openjdk.org/jdk/pull/25653