Fix typo in tutorial for exporting llm

[liu-mengyang]

Summary

Fix typo in Exporting LLMs

Test plan

No test needed.

cc @mergennachin @byjlw @larryliu0820 @cccclai @helunwencser @jackzhxng @Gasoonjia

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15906

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❌ 2 New Failures, 1 Unrelated Failure

As of commit 5a191c4 with merge base d8c9c74 ():

NEW FAILURES - The following jobs have failed:

• pull / test-openvino-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 3691e7da849f66ec790426ee6552b2105e1e485434dcb21064e01a69f49aca0c /exec failed with exit code 1
• pull / unittest / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_linear_model

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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