Use our tutorial's checklist to improve our operators tutorials

[y4izus]

Using our tutorial guide, make sure that our operators tutorials has the quality we want, and if not, improve them:

• [ ] https://github.com/Qiskit/qiskit-tutorials/issues/1423
• [ ] https://github.com/Qiskit/qiskit-tutorials/issues/1424

[javabster]

closing this as opflow is now deprecated