[Docs] Patch multiplicative group in Shor tutorial (#3819)
[Docs] Patch multiplicative group in Shor tutorial (#3819)

Fixes #3814. Lower priority, but the multiplicative group function (which is only used pedagogically) contained 2 sometimes when it shouldn't.

Also clears outputs so this is tested.
balopat/Cirq,balopat/Cirq,balopat/Cirq,quantumlib/Cirq,quantumlib/Cirq,quantumlib/Cirq,quantumlib/Cirq,quantumlib/Cirq