edit readme.md

[kirklandsign]

Stack from ghstack (oldest at bottom):

• Use pytorchbot token #6269
• Bypass no op #6268
• edit readme.md again #6267
• -> edit readme.md #6266
• Script to ghstack land #6265

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/6266

• 📄 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 78c4996 with merge base 35aeaca ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for .github/scripts/propose_ghstack_orig_pr.py:
• pull / unittest / linux / linux-job (gh)
  exir/tests/test_joint_graph.py::TestJointGraph::test_joint_graph

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