jmx-dev RFR: 8374373: Correct typo in VirtualThreadSchedulerMXBean.java Javadoc

[eunbin son]

### Summary
Fix typo in VirtualThreadSchedulerMXBean Javadoc: "suppored" → "supported".

### Description
Line 79 in VirtualThreadSchedulerMXBean.java contains a typo in the `@throws UnsupportedOperationException` documentation. The word "suppored" is corrected to "supported".

### Bug ID : JDK-8374373
https://bugs.java.com/bugdatabase/view_bug?bug_id=8374373

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Commit messages:
 - 8374373: Correct typo in VirtualThreadSchedulerMXBean.java Javadoc

Changes: https://git.openjdk.org/jdk/pull/29002/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29002&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374373
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29002.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29002/head:pull/29002

PR: https://git.openjdk.org/jdk/pull/29002