Update unsafe superpowers list from 5 to 8#4761
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The Rust Reference documents 8 unsafe operations, but the book only listed 5 and implied the list was exhaustive. This commit: - Replaces "five" with "several" to avoid implying exhaustiveness - Adds the three missing items: - Calling a target_feature-annotated function without that feature enabled - Declaring an unsafe extern block - Applying an unsafe attribute to an item Fixes rust-lang#4709
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The Rust Reference documents 8 unsafe operations, but the book only listed 5 and implied the list was exhaustive. This commit:
Fixes #4709