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Update pybinding README (#9770)

### Summary
After https://github.com/pytorch/executorch/pull/9583 and
https://github.com/pytorch/executorch/pull/9611, we don't rely on
environment variables to turn on pybindings.

### Test plan

Read + run example commands.
J
jathu committed
ea2029db8508fe8148af878e2930b17bae2e3dad
Parent: 8ca1507
Committed by GitHub <noreply@github.com> on 3/31/2025, 9:44:56 PM