Fix outdated lintrunner directions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 Fix outdated lintrunner directions #14449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

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❌ 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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