Clippy Book Chapter Updates Reborn: Trait Checking
This PR adds a new chapter to the book: "Trait Checking". No major changes from the source (just some typos, re-phrasing, the usual).
## Notes
- Does not require any other PR to be merged.
- To talk about the whole project, please use the tracking issue for the project #10597 (It also contains a timeline, discussions and more information)
changelog: Add a new "Trait Checking" chapter to the book
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