Remove comment in with_graph

Author: dersam

rust/rubydex-sys/src/graph_api.rs

@@ -43,9 +43,6 @@ pub fn with_graph<F, T>(pointer: GraphPointer, action: F) -> T
 where
     F: FnOnce(&Graph) -> T,
 {
-    // Create a shared reference directly from the raw pointer. This avoids Box::from_raw,
-    // which would imply unique ownership and create a temporary &mut Graph — UB when
-    // multiple Ractors read the same shared, frozen graph concurrently.
     let graph = unsafe { &*pointer.cast::<Graph>() };
     action(graph)
 }