Addition note for ETDump

[cccclai]

Added note about ET_EVENT_TRACER_ENABLED flag requirement for ETDump.

[pytorch-bot]

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❌ 3 New Failures, 1 Unrelated Failure

As of commit 2f75921 with merge base 793180f ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  test_inception_v3_fp16
• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t 68e72542b4baa95f1a4d05400e29d03b121d8693229daf5aa33090b0755b3461 /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (mistralai, Voxtral-Mini-3B-2507, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t e2a3fc999124f6248ab3a5964c51d51ab1092be7154b84db1d5610a21aedc7e3 /exec failed with exit code 1

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• pull / android / run-emulator (gh) (#16137)
  Timeout waiting for emulator to boot.

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