rust: list: remove nonexistent generic parameter in link

`ListLinks` does not take a `T` generic parameter, unlike
`ListLinksSelfPtr`.

Thus fix it, which makes it also consistent with the rest of the links
in the file.

Fixes: 40c5329 ("rust: list: add macro for implementing ListItem")
Reviewed-by: Tamir Duberstein <tamird@gmail.com>
Link: https://lore.kernel.org/r/20250719232500.822313-1-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: ojeda

rust/kernel/list/impl_list_item_mod.rs

@@ -17,13 +17,13 @@
 /// [`ListLinks<ID>`]: crate::list::ListLinks
 /// [`ListItem`]: crate::list::ListItem
 pub unsafe trait HasListLinks<const ID: u64 = 0> {
-    /// Returns a pointer to the [`ListLinks<T, ID>`] field.
+    /// Returns a pointer to the [`ListLinks<ID>`] field.
     ///
     /// # Safety
     ///
     /// The provided pointer must point at a valid struct of type `Self`.
     ///
-    /// [`ListLinks<T, ID>`]: crate::list::ListLinks
+    /// [`ListLinks<ID>`]: crate::list::ListLinks
     unsafe fn raw_get_list_links(ptr: *mut Self) -> *mut crate::list::ListLinks<ID>;
 }