rust: file: add intra-doc link for 'EBADF'

The `BadFdError` doc comment mentions the `EBADF` constant but does
not currently provide a navigation target for readers of the
generated docs. Turning the references into intra-doc links matches
the rest of the module and makes the documentation easier to
explore.

Suggested-by: Onur Özkan <[email protected]>
Link: Rust-for-Linux#1186
Signed-off-by: Tong Li <[email protected]>
Reviewed-by: Onur Özkan <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>

Author: Webb321

rust/kernel/fs/file.rs

@@ -448,9 +448,9 @@ impl Drop for FileDescriptorReservation {
     }
 }
 
-/// Represents the `EBADF` error code.
+/// Represents the [`EBADF`] error code.
 ///
-/// Used for methods that can only fail with `EBADF`.
+/// Used for methods that can only fail with [`EBADF`].
 #[derive(Copy, Clone, Eq, PartialEq)]
 pub struct BadFdError;