message: Update grow_memory example
diff: (memory 1)
  (func $main (export "main") (result i32)
  (drop (memory.grow (i32.const 1)))
  - (i32.store (i32.const 400) (i32.const 1600))
  - (i32.load (i32.const 1600))
  + (i32.store (i32.const 0) (i32.const 1600))
  + (i32.load (i32.const 0))
  )
  )
  