Update success-stories.md

[metascroy]

Update unsloth QAT story to use qwen example, which has more details than llama example.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15309

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❌ 3 New Failures, 2 Unrelated Failures

As of commit 94074e3 with merge base f81d768 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv1d.py::TestConv1d::test_qs8_conv1d_batchnorm_seq
• pull / unittest-editable / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv3_model
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 9dfc2a7fd1f82c665507912f64e3e4c7e44ec857024f40bb1e6fbc88d70187e8 /exec failed with exit code 1

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure)
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)

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