RFR: 8347431: Update ObjectMonitor comments [v3]

[Coleen Phillimore]

> Please review this change that removes a couple of comments that are not true (verified with testing metadata at offset 8).  There are no functional changes.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Add TODO

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/23042/files
  - new: https://git.openjdk.org/jdk/pull/23042/files/6c44c449..934c7c53

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23042&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23042&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23042.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23042/head:pull/23042

PR: https://git.openjdk.org/jdk/pull/23042