message: doc(c-api) Fix documentation.
diff: @@ -21,11 +21,6 @@ pub struct wasm_extern_t {
  wasm_declare_boxed_vec!(extern);
  /// Copy a `wasm_extern_t`.
  -///
  -/// # Example
  -///
  -/// ```rust
  -/// ```
  #[no_mangle]
  pub unsafe extern "C" fn wasm_extern_copy(r#extern: &wasm_extern_t) -> Box<wasm_extern_t> {
  Box::new(r#extern.clone())
  