rust: init: remove unneeded #[allow(clippy::disallowed_names)]

These few cases, unlike others in the same file, did not need the `allow`.

Thus clean them up.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Trevor Gross <tmgross@umich.edu>
Tested-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://lore.kernel.org/r/20240904204347.168520-10-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
(cherry picked from commit d5cc7ab0a0a99496de1bd933dac242699a417809)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Author: ojeda

src/lib.rs

@@ -122,7 +122,6 @@
 //! To declare an init macro/function you just return an [`impl PinInit<T, E>`]:
 //!
 //! ```rust
-//! # #![allow(clippy::disallowed_names)]
 //! # #![feature(allocator_api)]
 //! # use pinned_init::*;
 //! # #[path = "../examples/error.rs"] mod error; use error::Error;
@@ -410,7 +409,6 @@ macro_rules! stack_try_pin_init {
 /// The syntax is almost identical to that of a normal `struct` initializer:
 ///
 /// ```rust
-/// # #![allow(clippy::disallowed_names)]
 /// # use pinned_init::*;
 /// # use core::pin::Pin;
 /// #[pin_data]
@@ -455,7 +453,6 @@ macro_rules! stack_try_pin_init {
 /// To create an initializer function, simply declare it like this:
 ///
 /// ```rust
-/// # #![allow(clippy::disallowed_names)]
 /// # use pinned_init::*;
 /// # use core::pin::Pin;
 /// # #[pin_data]
@@ -510,7 +507,6 @@ macro_rules! stack_try_pin_init {
 /// They can also easily embed it into their own `struct`s:
 ///
 /// ```rust
-/// # #![allow(clippy::disallowed_names)]
 /// # use pinned_init::*;
 /// # use core::pin::Pin;
 /// # #[pin_data]