Qualcomm AI Engine Direct - docs fix

[pytorchbot]

Summary

update README on python dependencies and recommended QNN version

cc @cccclai @winskuo-quic @shewu-quic @haowhsu-quic @cbilgin

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14948

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 10 New Failures

As of commit 9a47d56 with merge base e0dda90 ():

NEW FAILURES - The following jobs have failed:

• Build Windows Wheels / pytorch/executorch / build-wheel-py3_10-cpu (gh)
  Process completed with exit code 1.
• Build Windows Wheels / pytorch/executorch / upload / upload-wheel-py3_10-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.10_cpu_x64
• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  RuntimeError: Command docker exec -t 135efcd881af31b6ad37d61b044bbf56114ce16b77f8edefe5b81e3352786217 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
  RuntimeError: Command docker exec -t bd38d25e5357bbbb388b3b918628a13eacd36bbe770ce5131c08754591d341ed /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.12) / linux-job (gh)
  RuntimeError: Command docker exec -t 1bac9a55ac9a49348f037699eb03383aae550b509c3f2619a334272d819deebb /exec failed with exit code 1
• pull / unittest / macos / macos-job (gh)
  The process '/usr/bin/git' failed with exit code 1
• pull / unittest / windows / windows-job (gh)
  Process completed with exit code 1.
• pull / unittest-buck / macos / macos-job (gh)
  The process '/usr/bin/git' failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  The process '/usr/bin/git' failed with exit code 1
• pull / unittest-editable / windows / windows-job (gh)
  Process completed with exit code 1.

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