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Rollup merge of #143219 - zachs18:patch-5, r=tgross35

Show auto trait and blanket impls for `!` Add an empty `impl ! {}` so rustdoc shows auto trait impls and blanket impls on `!`'s documentation page. This is already done for [unit](https://github.com/zachs18/rust/blob/2f0ad2a71e4a4528bb80bcb24bf8fa4e50cb87c2/library/core/src/primitive_docs.rs#L493), [tuples](https://github.com/zachs18/rust/blob/2f0ad2a71e4a4528bb80bcb24bf8fa4e50cb87c2/library/core/src/primitive_docs.rs#L1148), and [`fn` pointers](https://github.com/zachs18/rust/blob/2f0ad2a71e4a4528bb80bcb24bf8fa4e50cb87c2/library/core/src/primitive_docs.rs#L1874). cc #97842 ``@notriddle`` which added the same for unit and tuple. <details><summary>Comparison</summary> [Before (current):](https://doc.rust-lang.org/nightly/std/primitive.never.html) ![image](https://github.com/user-attachments/assets/eab8126d-8d65-46d4-8dc7-3680f3162ce3) After: ![image](https://github.com/user-attachments/assets/e0868113-ebef-4c64-ac30-dfe740d7ea38) </details> ``@rustbot`` label A-docs F-never_type

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library/core/src
- primitive_docs.rs

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`‎library/core/src/primitive_docs.rs`

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Original file line number	Diff line number	Diff line change
`@@ -316,6 +316,11 @@ mod prim_bool {}`
`316`	`316`	`#[unstable(feature = "never_type", issue = "35121")]`
`317`	`317`	`mod prim_never {}`
`318`	`318`
	`319`	`+// Required to make auto trait impls render.`
	`320`	`+// See src/librustdoc/passes/collect_trait_impls.rs:collect_trait_impls`
	`321`	`+#[doc(hidden)]`
	`322`	`+impl ! {}`
	`323`	`+`
`319`	`324`	`#[rustc_doc_primitive = "char"]`
`320`	`325`	`#[allow(rustdoc::invalid_rust_codeblocks)]`
`321`	`326`	`/// A character type.`

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