8361175: JFR: Document differences between method sample events

[egahlin]

Could I have a review that clarifies how the method sample events work?

• Added descriptions to NativeMethodSample, ExecutionSample and CPUTimeSample to clarify what they sample and what they don't sample.
• Removed the word "Method" from the labels of the CPUTimeSample and "ExecutionSample events for consistency and to avoid overly verbose event labels.
• Added the word "setting" so that the description of CPUTimeSample reads "throttle setting" instead of just "throttle".
• Changed the label for the CPUTimeSamplesLost event to "CPU Time Samples Lost", making it easier to associate with "CPU Time Sample" event.
• Removed the percentage column from the "native-methods" view, as normalization doesn't make sense when mixing executing and waiting samples.

Testing: tets/jdk/jdk/jfr + tier1

Thanks
Erik

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• JDK-8361175: JFR: Document differences between method sample events (Bug - P3)

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