Fix IonQ example in README

Signed-off-by: Katharine Hyatt <67932820+kshyatt-aws@users.noreply.github.com>

README.md

@@ -57,8 +57,8 @@ c = H(c, 0)
 c = CNot(c, 0, 1)
 c = Expectation(c, Observables.X()) # measure X on all qubits
 
-dev = IonQ()
-res = result(run(dev, c, shots=0))
+dev = AwsDevice("arn:aws:braket:::device/qpu/ionq/ionQdevice")
+res = result(run(dev, c, shots=10))
 ```
 
 ## TODO and development roadmap