RFR: 8337676: JFR: Change the label of the throttle setting

[Erik Gahlin]

Could I have a review of a change that makes the throttle label more consistent with the labels of other settings?

- "Threshold"
- "Period"
- "Stack Trace"
- "Enabled"
- "Cutoff"
- "Level"
- "Event Emission Throttle" -> "Throttle"

Testing: jdk/jdk/jfr

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/20426/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20426&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337676
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20426.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20426/head:pull/20426

PR: https://git.openjdk.org/jdk/pull/20426