RFR: 8344595: Naming incorrect for WAIT state in VirtualThread documentation

[kabutz]

See internal bug review 9077848

This is a very small unimportant mistake in the naming of the documentation that does not match the code.

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Commit messages:
 - Made documentation match state field names WAIT and TIMED_WAIT

Changes: https://git.openjdk.org/jdk/pull/22253/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22253&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344595
  Stats: 6 lines in 1 file changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/22253.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22253/head:pull/22253

PR: https://git.openjdk.org/jdk/pull/22253