chore: some typos found using `typos` cli

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.91%. Comparing base (f158384) to head (a8fa01d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1247 +/- ## ======================================= Coverage 86.91% 86.91% ======================================= Files 99 99 Lines 19023 19023 Branches 17015 17015 ======================================= Hits 16533 16533 Misses 1713 1713 Partials 777 777 ``` | [Flag](https://app.codecov.io/gh/CQCL/hugr/pull/1247/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CQCL) | Coverage Δ | | |---|---|---| | [rust](https://app.codecov.io/gh/CQCL/hugr/pull/1247/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CQCL) | `86.47% <100.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CQCL#carryforward-flags-in-the-pull-request-comment) to find out more.

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