Fix clippy issues flagged by latest rust version (backport #13405) #13409
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Summary
This commit fixes 2 issues flagged by running by clippy with Rust 1.82. We run clippy in CI with Qiskit's MSRV of 1.70, as sometimes clippy will flag failures for not using a syntax which isn't compatible with the MSRV. These issues flagged here are real, and good to fix, especially the docstring one, the
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comment isn't a docstring and that excludes the circuit diagram from the docs which wasn't the intent there.Details and comments
This is an automatic backport of pull request #13405 done by [Mergify](https://mergify.com).