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rustc_ast: Update `P<T>` docs to reflect mutable status. `P<T>` has implemented `DerefMut` since #54277. While this was lamented at the time [1], rustc now relies on it extensively via the many implementors of MutVisitor [2]. Updates the docs to reflect that `P<T>` is fundamentally mutable, and a few other cleanups to make them nicer to browse. [1]: https://github.com/rust-lang/rust/pull/54277#discussion_r257181754 [2]: https://doc.rust-lang.org/1.77.1/nightly-rustc/rustc_ast/mut_visit/trait.MutVisitor.html#implementors r? `@Nilstrieb`