Fix typos in arena comments

Author: bugadani

compiler/rustc_arena/src/lib.rs

@@ -533,7 +533,7 @@ impl DropArena {
         ptr::write(mem, object);
         let result = &mut *mem;
         // Record the destructor after doing the allocation as that may panic
-        // and would cause `object`'s destuctor to run twice if it was recorded before
+        // and would cause `object`'s destructor to run twice if it was recorded before
         self.destructors
             .borrow_mut()
             .push(DropType { drop_fn: drop_for_type::<T>, obj: result as *mut T as *mut u8 });
@@ -560,7 +560,7 @@ impl DropArena {
         mem::forget(vec.drain(..));
 
         // Record the destructors after doing the allocation as that may panic
-        // and would cause `object`'s destuctor to run twice if it was recorded before
+        // and would cause `object`'s destructor to run twice if it was recorded before
         for i in 0..len {
             destructors.push(DropType {
                 drop_fn: drop_for_type::<T>,