Update tests/pass/address-reuse.rs

Co-authored-by: Ralf Jung <post@ralfj.de>

Author: oli-obk

tests/pass/address-reuse.rs

@@ -1,6 +1,6 @@
 //! Check that we do sometimes reuse addresses.
 use std::collections::HashSet;
-//@only-miri: global allocators behave differently
+//@only-miri: reuse is rare on the real allocator
 
 fn main() {
     let count = 100;