Update README with end recording command

[maykelrodrigs-source]

Fix documentation: replace AOT.end_training with AOT.end_recording

The documentation refers to jcmd AOT.end_training as the command to end a training run, but this command does not exist. The correct command is jcmd AOT.end_recording.

Running the documented command produces:

java.lang.IllegalArgumentException: Unknown diagnostic command
Verified on builds b487 and b489 (27-testing, 2026-03-18, linux/x86_64).

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[maykelrodrigs-source]

/covered

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