RFR: 8327361: Update some comments after JDK-8139457 [v2]

[Roman Kennke]

> A follow-up to [8139457: Relax alignment of array elements](https://bugs.openjdk.org/browse/JDK-8139457) ([PR](https://git.openjdk.org/jdk/pull/11044)), some comments need an update.

Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:

  RISCV changes

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/18120/files
  - new: https://git.openjdk.org/jdk/pull/18120/files/a14c0c9c..2da3ee69

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18120&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18120&range=00-01

  Stats: 6 lines in 1 file changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/18120.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18120/head:pull/18120

PR: https://git.openjdk.org/jdk/pull/18120