rust: kernel: fix typos in code comments

Fix spelling mistakes in code comments.

Signed-off-by: Michael Vetter <jubalh@iodoru.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/20240819205731.2163-1-jubalh@iodoru.org


[ Reworded slightly. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>