RFR: 8359922: Incorrect comment for variable NMethodSizeLimit

[SendaoYan]

Hi all,

This PR fix a incorrect for variable `NMethodSizeLimit`. The default value of `NMethodSizeLimit` is `64K * wordSize`.

Trivial fix, no risk.

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Commit messages:
 - 8359922: Incorrect comment for variable NMethodSizeLimit

Changes: https://git.openjdk.org/jdk/pull/25873/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25873&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8359922
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25873.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25873/head:pull/25873

PR: https://git.openjdk.org/jdk/pull/25873