Fix outdated lintrunner directions

[swolchok]

They had the wrong version, but also should just point people toward the script that will install the right version.

[swolchok]

Stack from ghstack (oldest at bottom):

• -> Fix outdated lintrunner directions #14449

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14449

• 📄 Preview Python docs built from this PR

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

❌ 2 New Failures

As of commit ccce007 with merge base 8c74545 ():

NEW FAILURES - The following jobs have failed:

• pull / test-llava-runner-linux / linux-job (gh)
  RuntimeError: Command docker exec -t c0eaa37f0138b87f363bd881342b1dac3aeea661285725907ec02ed0d245cd1a /exec failed with exit code 139
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t eea4c59a12654c8c87034202437d28731712bca68e040c333ec69c515b218869 /exec failed with exit code 1

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[psiddh]

@pytorchbot cherry-pick --onto release/1.0 -c docs

[pytorchbot]

Cherry picking #14449

Command git -C /home/runner/work/executorch/executorch cherry-pick -x -X theirs 30568d275dfed2310ac4ea0b5d7de8522916d883 returned non-zero exit code 1

Auto-merging CONTRIBUTING.md
The previous cherry-pick is now empty, possibly due to conflict resolution.
If you wish to commit it anyway, use:

    git commit --allow-empty

Otherwise, please use 'git cherry-pick --skip'
On branch cherry-pick-14449-by-pytorch_bot_bot_
You are currently cherry-picking commit 30568d275d.
  (all conflicts fixed: run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

nothing to commit, working tree clean

Details for Dev Infra team

Raised by workflow job