[eclipse-iceoryx#210] Fix cargo doc

iceoryx2-ffi/ffi/src/api/notifier.rs

@@ -133,7 +133,7 @@ impl HandleToType for iox2_notifier_h_ref {
 ///
 /// # Safety
 ///
-/// * `notifier_handle` is valid, non-null and was obtained via [`iox2_port_factory_notifier_builder_create`]
+/// * `notifier_handle` is valid, non-null and was obtained via [`iox2_port_factory_notifier_builder_create`](crate::iox2_port_factory_notifier_builder_create).
 /// * `id_struct_ptr` - Must be either a NULL pointer or a pointer to a valid [`iox2_unique_notifier_id_t`].
 ///                         If it is a NULL pointer, the storage will be allocated on the heap.
 /// * `id_handle_ptr` valid pointer to a [`iox2_unique_notifier_id_h`].