rust: helpers: Fix grammar in comment

s/directly the bindings/the bindings directly/

Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com>
Reviewed-by: Trevor Gross <tmgross@umich.edu>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20240411205428.537700-1-thorsten.blum@toblux.com


Signed-off-by: Miguel Ojeda <ojeda@kernel.org>