RFR: 8332610: Remove confusing comment in ObjectMonitor::ReenterI

[Johan Sjölen]

Hi,

This comment only serves to confuse people, as `nWakeups` is not shared between threads and never read. It is probably meant for debugging (not sure). Let's delete the comment.

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Commit messages:
 - Remove comment

Changes: https://git.openjdk.org/jdk/pull/19326/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19326&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332610
  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19326.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19326/head:pull/19326

PR: https://git.openjdk.org/jdk/pull/19326