message: Update examples/engine_headless.rs
diff: //!
  //! Once a Wasm module is compiled into executable code and stored
  //! somewhere (e.g. in memory with the Universal engine, or in a native
  -//! object with the native engine), the module can be instantiated and
  +//! shared object file with the native engine), the module can be instantiated and
  //! executed. But imagine for a second the following scenario:
  //!
  //! * Modules are compiled ahead of time, to be instantiated later
  