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

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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

Open the linked Hadamard Test notebook page and locate the repeated incorrect inner-product expressions and the deprecated nvidia-mqpu syntax. Update those documented examples, check for the other typos mentioned in the issue, and verify the rendered page uses the corrected wording and current syntax.