Fix may not to appropriate might not or must not

library/alloc/src/vec/mod.rs

@@ -2229,7 +2229,7 @@ impl<T, A: Allocator> Vec<T, A> {
         unsafe {
             let mut ptr = self.as_mut_ptr().add(self.len());
             // Use SetLenOnDrop to work around bug where compiler
-            // may not realize the store through `ptr` through self.set_len()
+            // might not realize the store through `ptr` through self.set_len()
             // don't alias.
             let mut local_len = SetLenOnDrop::new(&mut self.len);