typo in Hadamard Test notebook and deprecated nvidia-mqpu needs updated in documentation

[mmvandieren]

Required prerequisites

• Consult the security policy. If reporting a security vulnerability, do not report the bug using this form. Use the process described in the policy to report the issue.
• Make sure you've read the documentation. Your issue may be addressed there.
• Search the issue tracker to verify that this hasn't already been reported. +1 or comment there if it has.
• If possible, make a PR with a failing test to give us a starting point to work on!

Describe the bug

https://nvidia.github.io/cuda-quantum/latest/examples/python/tutorials/hadamard_test.html

$\langle \psi | O \langle \psi\rangle$ should be $\langle \psi | O \langle \phi\rangle$ in a few places.

Steps to reproduce the bug

access webpage

Expected behavior

no typos

Is this a regression? If it is, put the last known working version (or commit) here.

Not a regression

Environment

• CUDA Quantum version:
• Python version:
• C++ compiler:
• Operating system:

Suggestions

I'll make a pr fixing this an any other typos found.

deprecated nvidia-mqpu should be replaced with the updated syntax